You can never preemptively ban Exploits/glitches like this as who is to say what is a deliberate mechanic and what is a glitch, but in this case it doesn't feel like something that's within the spirit of the game.
I tried it out today while flying a Pyra, and it was easy as pie, and if you got it down, and aimed for a flat bit of ground wouldn't take a moment. (Sorry Smollett et al!)
I don't feel like wading into the ethics of competitive play, but its something that made me feel shitty for doing, and I would support putting on a ban list for future cogs matches (Maybe just say no deliberate suicide? Might be some debate about how deliberate something is, but in practice I think it would be easy to tell if someone killed themselves on purpose).
Also, I don't think anyone was QQ'ing, did you really expect for there not to be a thread on the forums about it if you did it in a cogs match? Eh, what's done is done I suppose.