I appreciated how the reddit app I used (relay) kept everything internal. I don’t want all the links I open on this app opening in my browser and plugging up my history. I doubly appreciated how it would open YouTube links in an internal video player that wasn’t linked to my YouTube account in any way. This is a must have for me to prevent my YouTube “algorithm” from getting any ideas. For example, I watch a video about “X” and now my whole feed is suggesting I watch more videos about whatever “X” was.
The ability to use custom tabs has been good enough for me, but I guess an internal WebView could be a good option for some users as well.
Protip regarding the YouTube recommendations algorithm: you can go to playback history and remove and entry from there. That way, it’s like you never watched it in the first place, and as such, you shouldn’t get any more recommendations based on that playback.