Hussar
Legend
I've had a similar thought before. When you decide to play a mage, you choose which gameplay elements you want to specialize in through your spell selection: whether you want to play a combat-focused blaster or an illusionist or a utility caster or whatever, those all fall under the category of "wizard" or "sorcerer". But when you decide to play a martial character, you make that choice at the earlier point of class selection. Picking the fighter class is not, in this sense, equivalent to picking the wizard class; it's equivalent to picking the wizard class and then picking a heavy load of nuke spells, because you're telling the game system that you want to focus on your combat strength.
Now, this is less true in 5th Edition than in previous editions because the background system gives fighters a much more open selection of skills. I have a player who always played barbarians in 3E and is now playing a fighter in 5E. What made 3E barbarians special to him was not their speed or their rage, but their extra class skills and skill points - in particular, he really liked having Wilderness Lore/Survival. Since 5E fighters have been brought up to the same level as barbarians on the skill front, he's branched out, and is really enjoying his character.
But that's an aside. Even in 5E, the fighter class still has a distinct focus on, well, fighting, while the wizard determines its focus through spells. My question is this: is there anything wrong with one model or the other? On the martial side, you pick your specialization through class; on the magic side, you pick it within your class. Sure, there might be balance issues in the details of the class features, but that's not what I'm talking about. Generally speaking, is there any reason to prefer broader or narrower classes?
Nope, there's nothing wrong with one or the other model. But, why should the models be an either/or here? I can certainly specialise my wizard at chargen - choose Sorcerer or Warlock. And, then afterwards, I get to specialise again through my spell selection.
Why not add that level of breadth to fighters? In answer to you question, I'd say that the best of both worlds is to give the option of broader or narrower to all class types.
Heck, "broader" and "narrower" might not even be the best way to conceptualize the distinction here. The fighter is focused on combat dominance, but has very broad options for how it fights. Call it broad means to a narrow end. The wizard can choose a lot of different focuses, but its particular spellcasting mechanic remains the same. Call it narrow means to a broad end. The fighter is defined by its end; the wizard by its means. So the question becomes, is there any reason to prefer end-defined classes or means-defined classes?
Actually, that's part of the problem. Fighter's don't have broad options for how it fights. You choose your specialisation at chargen, choose your weapons at chargen, and that's pretty much the sum total of decision points for the life of that character. If you choose Protection based sword and board fighters, you can't really pick up two weapon fighting and archery style later on down the line. You do get to pick one extra style at 10th (?), but, that's a pretty pale number of choices compared to any caster who can change its specialisation every day and add additional depth to those choices every level with additional spells. Heck, wizards don't even need to wait for new levels. If they find a spell book, they get to add new choices right away.
I mentioned earlier about a fighter being able to change its specialisation after a long rest with the idea that the fighter knows all specialisations at chargen, but can only focus on one at a time. It was a rough idea and certainly not without bumps. But, funnily enough, people can't wrap their heads around the fighter deciding that today he's fighting Capa Vera, and tomorrow he's doing Drunken Master, but have no problem with the wizard completely changing his entire suite of options every 8 hours.
Magic must be pretty darn easy to learn.
I gather the fighter is the mundane fighting man in D&D. They want to keep it that way. It's the straightforward, simplest class to play. I imagine WotC wants to keep such a class as a choice because some players want that.
And that's not the issue. I agree, fighter should be one of, if not the, simplest option in the game. Fantastic. But, why can't we have a simple fighter alongside a complex one. One thing that Essentials 4e did prove is that you can change up the options of a character without changing the power levels. Essentials fighters were far, far simpler than PHB fighters, but, neither was stronger than the other.