Look, it's not about people should or should not suggest whatever to se, it's about how people do it. If people are gonna suggest something huge such as a new class, dungeon or whatever, be prepared to argue, defend your argument and prove to se and everyone against your proposal that what you what your suggesting is something legitimate. Saying something like, "just cuz", "because it's cool", or "x or riot" spamming the thread is not an argument, it's an excuse. Tell me, why should SE listen to a bunch of kids spamming "x or riots"? Act like a kid, you'll get treated like one. You want people to listen to you? Present your proposal properly. Provide pros and cons on why it should be added. Keep it civil, don't start a flame war with troll baits. Don't call anyone who argues against it a "white knight" and vice versa.

Tl;dr. If you're gonna ask for something HUGE like a new class, do it professionally and properly.