How do you listen to music?

Do you also save Youtube bookmarks and/or mostly listen to music from Youtube?

I've used both Spotify and Deezer. Both have their pros and cons, but somehow I always end up going to Youtube which is more universal. It works everywhere and you only need a link to a video to listen to it at home, in the office, on your phone, basically everywhere. Without the need for specific apps, or paid user accounts. In my opinion, Youtube also offers a better source of long-form mixes and that tends to be the first thing people reach for in informal gatherings and small parties, at least in my experience.

Why do I ask this? I have a big number of Youtube bookmarks(I don't use/like Youtube's playlist solution), that will most certainly only grow because I've decided to build a simple web app that can be used to create a playlist from Youtube links, shuffle and play indefinitely so I won't need to navigate the videos manually once the playlist has been set.
Would anybody else consider something like this useful? I want to know is it worth to invest more time and effort to make this useful for a broader audience?

The main features would be: quick playlist creation from Youtube links, shuffle, no ads, easy append more videos, indefinite reproduction of videos while the page is opened(downside will be that tab needs to be open to load and play songs). Best use cases for this are personal use to easily create playlists for the specific moment, but also for informal gatherings or parties where there are usually people switching places while navigating through Youtube songs.

In any case, I'll create a basic version in a couple of days and share it. The only question is how far should I go with the quality of the user interface and the intuitiveness level if someone else would like to use it too.

Thank you for any feedback!