When I say that the Wizard should be the Books/Rituals subclass of sorcerer I'm only slightly joking.
Whereas for me, I want them to pare back its "ALL THE SPELLS,
ALL THE TIME" emphasis, and instead turn it into an actual
experimentalist spellcaster. Not metamagic, but rather, actually developing spells over time. Testing things, trying combinations, finding out what works and what doesn't. Sort of the careful, procedural mirror to the Chaos Sorcerer; where Chaos embraces the weird (and sometimes stupid) stuff magic can do, the Wizard
interrogates it, slices it six ways from Sunday, trying to puzzle out the true
rules that hide behind the seemingly-capricious mystery.
They should be the omnidisciplinary scientist trope from sci-fi, just implemented in a fantastical context. Throw in
techno arcanobabble, actual (non-magic) research mechanics, and some ribbons for academic connections and publication allegiances and you've got the core of a genuinely really interesting, deeply thematic,
and better-balanced class that actually lives up to the hype of being the "complex" caster that is harder to play.
The fighter takes more finesse to fix because there's no one class that's almost like it but a lot in its space. I do wonder how much of the strength fighter you could melt into giving the barbarian a choice between rage-as-is and a mix of heavy armour and grit. (The armoured fighter gets barbarian rage damage resistances while wearing heavy armour even while not raging - but misses out on danger sense). There's a big pile-up between the dex fighter, the rogue, and the ranger (who is currently as much hedge wizard as anything).
Well. You know how I feel about the Fighter. I think we should be a lot looser about feats of heroism (not Feats, to be clear), letting the Fighter verge into the space of characters like Guan Yu, Hercules, King Arthur, Joan of Arc, Atalanta, etc. And that, whatever their chosen approach to fighting, they should be one tough son-of-a-beech, implacable and really difficult to take down, hence, a Defender at heart, whatever they choose to actually
do in combat.
I'd be interested. And probably disagree about some.
Here you go. Those marked with a dagger are the ones I think are most likely to be implemented. All of them have at least one class from at least one edition (counting PF1e as effectively a further edition of 3rd edition D&D, because it was.) I have similar X-as-magician or warrior-as-Y writeups for the existing thirteen classes, but that's not super relevant here (unless, again, you'd like those for comparison purposes or the like.)
- Alchemist†, the chemist-as-magician, who uses magical ingredients and concoctions to control the world...or themselves.
- Assassin†, the warrior-of-shadow, whose skill with all the subtle ways to stalk (and un-alive) someone transcends mortal limits.
- Avenger†, the warrior-of-zeal, whose absolute focus is both shield and sword against their enemies, who executes the turncoat apostate.
- Invoker, the emissary-as-magician, who calls down disaster upon the foes of the faith, Elijah calling fire down against the altar of Baal.
- "Machinist" (not my fav name), the warrior-of-technology, who uses guns, machines, and tools to overcome their foes.
- Psion† (etc.), the telepath-as-magician, who draws on ESP, the paranormal, occult "science" etc. to bend the rules of reality in their favor.
- Shaman, the spiritualist-as-magician, who straddles the line between material and spirit, the bridge connecting these realms.
- Summoner, the overseer-as-magician, whose magic lies in getting other beings to use magic for her.
- Swordmage†, the warrior-as-magician, for whom swordplay is magic, and magic is swordplay (or other weapons), one and inseparable.
- Warden, the warrior-of-the-land, who wears Nature's power like a cloak, and wreaks Her wrath where he walks.
- Warlord†, the warrior-of-tactics, who transcends limits by cooperating with others rather than purely through her own mettle.
More accurately most people care about balance to a point. They don't care about minutae but if they are too far behind the curve things feel bad.
The bigger problem is, it's
very easy to be in the no-man's-land between "obviously bad" (whether that be OP or weak) and "obviously good," where it's deeply unsatisfying but you just can't quite put your finger on
why it's so. Even if such a person
does realize that there's a pattern of dissatisfaction, there's no guarantee they'll simultaneously see what the problem is. That sort of thing is, unfortunately, a lot more likely than stumbling into something you genuinely love but can't express why. As with far too many things in life, there are a LOT more ways for things to be broken than there are ways for them to be excellent.