I'm sorry but I'd have to disagree that it being "too 1-shotty" is a bad thing. Other fights don't punish mistakes nearly enough and when a fight does you get people complaining that it should be like every other fight. Vuln stacks don't punish anyone unless you get like 3 or 4. Before that? People generally shrug it off and leave it to healer to top them up. And if you decide to not ignore mechanics between vuln stacks you just reset them meaning you can go back to ignoring everything.

People get away with being lazy or having tunnel vision too often in this game. Even casual level things should require you to pay attention and do the things.