Tried a couple of music videos and several of them didn’t so not sure how that’s supposed to work.
LibreTube has a clean and modern UI. As does Piped. PokeTube is all over the place and frankly looks as if it was designed by a 12 year old gamer. Same with the user settings and preferences, all spread out with no cohesion.
That’s fine, it’s her project, she’s allowed to design it the way she likes. However I dare say that it will turn off a lot of people.
More importantly though is the usability aspect. Fun and creative design is all good and well, but the messy layout, design and language is a real detriment to the ease of use. Good UI design should aim to be as clear and simple to use as possible, so that the product can get on with doing what it’s designed to do.
Posts aren’t locked unless the tool gets added to the site, in case something changes in the future. But I’m going to mark this suggestion as rejected for all the reasons @frostlike shared (mainly because we currently recommend 6 different YouTube frontends, all of which are cleaner and more well known)