Grayjay and Newpipe (and its forks) can do that, as well as just watching it like regular youtube, but also the option to select from other platforms - like peertube, as one example - to watch.

It is pretty good, you can watch videos from different plarforms. Mobile looks solid to me. Desktop doesn't have picture-in-picture, which sucks, cuz I like having a little screen in the corner as I work. Other then that, grayjay is pretty good.

Hah! Maybe tell them that's why Jesus isn't back yet, not enough trains!