I thought this as well, but I’ve started to think they could be useful if I follow way more aggressively, and create a list that is “what I want on my feed” and default to that. It’s stupidly cumbersome, but would have the desired effect. Of course you’re right that they should just let you add directly to a list - I think the reasoning for the current functionality is to limit stalking/harassment, though I don’t exactly understand how that is inhibited at all.