This feels like it's covered by YouTube subscriptions, no? Subscribe to those 100 channels, bookmark your subscriptions page, and presto! You now have a priority feed of the stuff you want to watch and nothing else.
Maybe you just don't want to create an account, which is fine (NewPipe is a great fit), but it's a bit weird to see you say that "making sure we don’t miss the things we love isn’t YouTube’s M.O." when there's an entire page dedicated to a chronologically-sorted list of videos from channels you pick.