Think this is a pretty important part of the client and needs to be re-addressed. As it stands, I can only remove people from my block list (its not even sorted so I cant find someone if I wanted to look for them). The block list location is clunky to get to and layout is bad for lists too. I don't even have the option to block someone in the endgame screen. Like really, do you even **THINK ABOUT FUNCTIONALITY** at all riot?
EDIT: On the 6.23 patch notes under 'client' Riot says that performance is #1 objective. IMO functionality>performance (which is why I will continue to use the legacy client until the same level of functionality has returned.)