I'm using this all the time myself. There is no login to YouTube required and it supports adding subscriptions and doing everything important you can do on YouTube.
For some reason, Freetube currently works well, Grayjay needs iOS fallback and barely works.
Grayjay follows the bigger, already implemented idea of combining multiple platforms. This is a great UX and smooth fallback when Youtube blocks again, or permanently.
Accounts can link multiple platforms, so switching is easier.
It also allows commenting, livechat, on the platforms and has on the polycentric protocol, connecting all others.
Yes, I also dont understand why Peertube works so badly. It is one of the platforms with the most quality content, but its decentralization really makes it require an app.
sepiasearch.org helps here, to connect all instances and index them
@boredsquirrel@slrpnk.net Same, PeerTube has so much good and interesting content, this content just doesn't get exposure because of bad discoverability