I don't like youtube's ux. I have so many subscriptions, I want to organize them in folders and clicking on a folder, I should be able to see all updates in that folder.
I can relate to that! "Subscriptions" tab's feed in their mobile app has always been useless for me, pure noise, so eventually I have reduced my subscriptions to a small count to ensure discovering stuff I'd most likely want to watch in the home feed.