Design choices that rub you the wrong way, huh? Guess I'll list a few of mine when it comes to RPGs...
--"Attack, Attack, Attack--it'd be Bolt-X but I'm not cool enough to be Jade"
Ah, the basic physical, often seen as a necessary evil to me. Boring, but free of cost and rather functional. Back in older days of RPGs, back when they were still emulating D&D or the like, fighters were expected to just have basic physicals and get by with those, while magic-users got all of these fun options that weren't pressing "Fight". Nowadays, however? There's no excuse for this. Physical fighters are just as allowed to have options as mages are at this point, where even 4e D&D gave fighters abilities that weren't basic physicals but still usable at-will!
...and then the 5e playtest comes along and they decide that while the magic system and basic physicals are worth showcasing, but variety options for physical characters? No, clearly not worthy of being in the playtest. Goddamnit, I thought Mearls was working on this edition.
My problem here is with characters who have nothing but basic physicals, and that the basic physical is expected to be a major part, if not the entirety, of their "strategy". Biggest offender to me? Gryz in Phantasy Star 4. The game showed more than enough competence in giving characters physical skillsets and the like (see Chaz, Alys, Rika, so on)...and then came Gryz. Whose skillset consisted, by endgame, of Brose, Crush, War Cry, and Sweeping. Brose is a crappy ID skill that is semi-reliable on machines, and that Gryz has the TP to cast...once, maybe twice. Crush is shitty ID. War Cry is a self-targeting attack buff. Sweeping is an airslash clone. One could argue that this is the best one could do for a magic-less "fighter" type--except that then they give you Demi while he's worn out his welcome (would rather keep Hahn than him, to be honest)...and then Wren right after, who pretty much obsoletes him in every single way possible. And has a fully-developed skillset.
Gryz, you are emblematic of everything wrong with the mentality of giving fighters basic physicals and little to nothing more.
--"Heal plz, Heal plz, Attack plz...wait, what do you mean you can only heal?"
I've made no real attempt to hide it. I hate characters who are set up to be healers and literally nothing more. Particularly problematic in SRPGs where they're either helpless outside of it, or in the most egregious cases (hi, FE) completely incapable of doing anything -but- healing. It's bad enough there, but then the Holy Trinity setup in MMOs? Assumes a pure healer whose job is to do nothing but watch lifebars and heal people. ...god, I hate the Holy Trinity setup.
--The Holy Trinity setup
Because the farthest we've come in MMOs is...creating false synergy via role assignment, giving meatshields and healbitches the social edge by their position and necessity among supply-and-demand, and making anyone who is neither of those simply "Yet Another Damage Dealer". I'm glad there are games at least trying to break away from this.
--Blatantly And Unapologetically Broken non-Temps
Yeah. This is annoying here, in my opinion. And I don't mean types like Raven, Athos(Super-late joiner), Orlandu (Late enough that a well-built party can overshadow him)...but more like Yuna. The types who can replace the entire party on their own. And frequently do.
--Elemental Copypasta
You know what I mean. Things that largely differ -only- in element; spells, weapons, bosses (hi, WA5!). We have no reason why there shouldn't be extra variance at this point. Made most egregious in Wild ARMs 5, where not only are the four Sentinels lacking any major quirks (after Brionac? Shameful), but their most notable difference...is what elements they've got weakness/immunity to.
--Punching Bags of HP
I will admit. Bosses need some durability. And hell, there is a time and a place for a well-placed slugfest. If you make every boss into a one-dimensional slugfest, though, few things bore me faster. Another strike against WA5 to me.