Update: After a day of using LibreTube, it's my new go-to. It offers a lot of the quality of life features I appreciate from the official YouTube app, such as automatic PiP when leaving the app and quick refreshing of new subscription uploads, while still giving me the privacy of Tubular/NewPipe. My only gripe is that the implementation of Return YouTube Dislikes does not offer the option to show dislikes as a percentage, but that's just minor. Lol.
For anyone whose videos are slow or not loading, you can increase the speed by toggling off the proxy function so that the app pulls directly from YouTube rather than from an instance. It recommends you to only do that if you're using a VPN for privacy reasons (which I am), but if you were already using Tubular/NewPipe without a VPN, doing so with LibreTube wouldn't be any different.
Tl;dr, LibreTube is great and is a nice hybrid of the YouTube app's functionality and Tubular/NewPipe's privacy. I would definitely recommend it. 👍