It seems like the main benefit of such frontends is the lack of trackers and fingerprinting, but what if the browser, like Firefox, already did that with UBlock Origin and fingerprinting protection?
This is even more true if you subscribe to channels using rss feeds from invidious, then simply use yt-dlp to grab the video directly from the URL. You also can use the noscript extension to selectively block the google video script and instead use yt-dlp to download the video. Using this over a no logging VPN like Mullvad prevents google from tracking your IP. Finally yt-dlp not only allows for use with invidious, but has a sponsorblock flag, which will cut out the mentions of sponsors in the video and then paste it back together, essentially autoskipping the sponsor mentions.
On Android, you can download an app from FDroid called Seal that basically uses yt-dlp, and can be customized to use the same flags.
