I am not a speedrunner but I am a avid watcher of many Twitch speedrunners. I know all the meta, items,effects,and what not.
I really disagree with being able to use overflow and co-op baby in speedruns. How can a speedrunner feel good about themselves then they cheat out a devil deal they can't take with out co-op baby, or how do they feel when they over-flow every game. This use to be a vanilla only speedrun (minus the save-file so you don't have to farm coins/unlock everyting, but that was justified by the community).
I as a viewer think it is down right wrong to use co-op baby and overflow(in every single character you use)
I agree with Pib. 100% on Overflow. (edit my bad) You are not running the vanilla game like stated you should. I get that there is the MissingHUD and I have no real problem with it. It doesn't block the runner's screen when running.
My vote is against Co-op baby "strats" and overflowing.
This type of thing has come up before in the Isaac speedrunning community and people were nicer back then. They didn't do co-op baby in runs. I haven't seen someone do it in Lemon Party or various other speedrunning races. So why start now? Because you know it is wrong and you don't just up and do it in a more public race setting, you have to sit in your more personal stream and do it.
I really hate it. It disgusts me.