I really hate whenever I try to explain how some bad rules can be abused and immediatelly get someone say shit like “If this happens in your group, change it” as if that would solve the problem. And whenever it is not soemthing you witnessed personally, then it means it never happens and could never happen.
It’s legit not hard to make an OP/powerful character in either VtM or CoC, assuming youre talking about making a character good at combat (which is usually what people talk about in this context with power gaming). I don’t play PF2e, though, so i cant speak there.
CoC take high dex, put 90+ in handguns, take the pulp talents rapid fire and quick draw, wear a bandolier of guns, and dual wield pistols that you fire 6 shots from per turn. If you dont care about going first, then fast load if you care about reloading, if not, then just take shadow and start combat hidden for two attacks with a bonus die at the start.
For VtM its easy as take fist of caine and lightning strike. If you aren’t playing as elders, this requires gaining some exp first. I know there’s other combos that i cant think of off hand that are pretty potent too.
Each of these do have counters in the form of monsters immune to guns (CoC), or celerity 5 opponents (VtM), but thats no different than a DM in D&D always throwing fireballs at the guy with high AC. It begins to be apparent when its happening all the time that the GM/DM/Keeper/whatever is specifically targeting your weakness.
Minmaxxing isn’t really the same as rules exploits - you can do those things to become really good at combat, but you’re sacrificing your abilities in other areas, which make up a significant part of the game. It’s not like hiding behind a tower shield to disappear or undead warlocks short resting to stack death ward, where you’re actively taking advantage of wording and rules interactions to achieve unintended effects.
i mean, if youre wanting exploitative rule mechanics based on wording/interactions, you need to look no further than base first aid and medicine in CoC; You’re able to make 1 of each per wound you take. Unlike older editions, they’ve done away with the heal cap on it, so if you’re down HP, simply deal yourself 1 HP of damage, make a first aid check. and then make a medicine check to heal at minimum 2 HP. Repeat until full. You can easily reheal yourself to full this way, which is definitely “unintended” based on how healing works (and older editions).
Edit: at the end of the day, my point is that pretending other games cant or dont have exploitative mechanics/builds/whatever is naive at best? It’s not a D&D only problem. It’s just more prevalent in D&D because 1) it has more rules and 2) it has more players.
I think you’ve conflated part of those rules - there’s nothing in the medicine skill saying you can only do it once per wound, just first aid. So you can deal/restore 1 damage in between medicine checks, but that’s not what let’s you keep making medicine checks.