I would love it.
I'm currently using DFInstagram, which removes home feed. Only downside I see is that is also removes Instagram stories which I do like to check, but I can do that from PC if I want.
As for YouTube I can already remove 99% of the distraction by just putting things to private and completely remove recommendations on home page, but reddit / Twitter / Facebook would be great.
For the social medias I'd love to just have "old mode" where I'm only ever shown stuff posted by people I explicitly follow. Everything went to total garbage when "engagement" became the goodhearts metric, and news feed either throw you astroturf, ads, and rage-bait posts by people I haven't even followed
I also use DFInstagram. You can keep stories; I have mine configured to kill the feed & cancerous search page grid but allow me to see stories. Works great.
Oh that would be great! I can't find where in the setting I can toggle this though
F.B. Purity[1] works great for Facebook. It can selectively remove ads, suggested crap, reels, etc.
[1]: https://www.fbpurity.com/