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.
That’s the flameskull from the d&d 5e monster manual