I just don't think that class models identity or even profession very well. Its a general guide, but I don't think any strong conclusions should be drawn from it about a given character. Mostly I don't think if you go the other way you get far, you can't divine a class from looking at someone. You might guess, but people in-game don't have that hard and fast an idea of these categories.
But, see, that's just it. My friend is pretty athletic, by ordinary standards, but only got interested in these (purely amateur) competitions pretty recently. So, to say her 'class' is 'Athlete' isn't really sensible, she's a management consultant (class Office Worker? lol). You could of course reflect this sort of thing in any post-2e version of D&D (somewhat in 2e perhaps as well) by various mechanisms. My point is, the man-at-arms and the hero don't particularly share a class, though they may identify with the same profession, or culture, etc. to some degree.
Yeah, but think about it this way. The followers of Otillis, some of them may be hunters, guides, scouts, priests, or just ordinary folk that are woodsmen, etc. Obviously they don't share a class, but is there a class for each of these categories, and what about other aspects of each character? Maybe one scout is a devotee of Otillis, but he's also streetwise and was built as a rogue (maybe with some background that reflects his wilderness aspect). Another might be a ranger class character, more of a 'classic', and a 3rd might simply be an old codger of an NPC that doesn't have any class at all, or used to be a sergeant and has a couple levels in fighter/battlemaster. Even if you translate this to AD&D the same kind of mix can exist. In some ways they identify together, and in some ways they group with other people unrelated to their religious affiliation and nature-going ways.
I just don't think that class models identity or even profession very well. Its a general guide, but I don't think any strong conclusions should be drawn from it about a given character. Mostly I don't think if you go the other way you get far, you can't divine a class from looking at someone. You might guess, but people in-game don't have that hard and fast an idea of these categories.
Whereas I find that removing the idea of classes sharing common, identifiable traits waters them down to nothing but "starting packages" of mechanics at best renders the term used to describe the class meaningless and at worst abusable by min-maxers. The idea that a member of the Paladin class wouldn't think of himself as a paladin, use that term to describe himself, or find commonalities with other members of the Paladin class is too much for me to swallow. I'd rather deal with characters introducing themselves as "Bob the Fighter" than have Warlocks joining "Wizard" Guilds, "Druid" Circles with no actual Druids in them, or Assassins wandering around calling themselves "Paladins".
In short: I want the name on the Tin (class) to represent what's inside the can (character).
The idea that you have soapmakers (qua soapmakers) training wizards, or accountants qua accountants training paladins isn't really worth running with further, for me.
Yeah, I think class is more than 'starting package', but to me there's nothing strange about "the Followers of the Old Faith" being from all different walks of life. The idea that they're all these highly regimented specific type of people who's entire set of attributes is focused on that one narrow bit of life seems stultifying and unnatural to me. IMHO the Miller down the road is the Keeper of the Circle because its a tradition in his family. He's not some high falutin' guy that knows the inner mysteries of the Oak and the Holly. He probably doesn't cast spells, or maybe he knows ONE simple invocation. Even the local head of the chapter isn't a druid per-se, he's actually a local knight from an ancient family. Now, the old man in the wood that keeps the old lore and such, HE's modelled using the druid class, because that's what he mostly does.
Now in 4e NONE of them would actually have a class, but their stat blocks would probably reflect elements drawn from the same ideas that druid powers and such are. The old man might well have a host of rituals suitable to druids, etc. He'd probably be CALLED a druid. The other characters I mentioned might also be called 'druids', they attend the rituals, they follow the faith, they've been inducted into at least some part of the secrets, etc.
Its not that I have a problem with the idea that holy warriors are easily represented by the rules of the paladin class, etc. There may even be a whole order of people that contain these warriors and they call themselves paladins, great! Its just there's probably a lot of ordinary fighters in there too, maybe they're not afforded the same status, I don't know. Maybe they can earn the TITLE 'paladin' too, even if they don't lay on hands, if they do something worthy. Class is IMHO too rigid to serve as the primary descriptor of characters in the world. To me each character is unique and sometimes its best to represent them with rules for a certain class, but their station in the world is not based entirely on class, that's only one dimension of the character.
So, yes, warlocks sometimes join wizard's guilds! Fighters, rangers, and rogues sometimes belong to holy orders of warriors. Clerics sometimes make their way in the world as thieves, and maybe that noble is an Avenger. Its all just tools. Flexibility in conception to me is the first brick in the house of being an outstanding DM or player.
See, this doesn't advance any discussion when its made nonsensical. Nobody is suggesting that some random 'accountant' will train a paladin. HOWEVER, I will state that the accountant of the Order of the Holy Light probably isn't a paladin. He's still a full member in good standing, and maybe he's a fighter or a more advanced statblock due to his exposure to all the training (perhaps he started out as one of the recruits, he just gravitated to what he does well). In game he's considered to be a Holy Brother, and is called 'Paladin'. And yes, he can train lower-level paladin class members of his order, at least up to a certain point. He knows and follows all the strictures and codes of his order, he's just not chosen to be filled with the Light of Atur, instead he keeps track of all the beehives and sacks of grain they need to be able to eat every night.