looking for an mp3 player (android)

i have a rather large music library on sd card (~250gb and well over 10k tracks) so i am looking for a player that is able to handle that. so far i…

I don’t know if this supports what you want but give Phocid a try, you scan library manually (it’s not scanned every time you open the app) and it has folder view (the main reason I’m using it), so you don’t need to change the metadata. It replaced VLC for me, might work for you.
Phocid | F-Droid - Free and Open Source Android App Repository

A modern offline music player with familiar designs

I use Phocid and its good but it has this thing that drives me insane. Default behavior is when you select a song to begin playing it as a playlist. But if you search it treats the results as a playlist. Ok fine I can long press the song and add to queue.

But I change the default behavior to select a song being add to queue there is no option to long press and play as a playlist. Am I using it wrong or missing a way to use the app properly?

When I long press any item it allows me to select multiple items (depending on a category it can be a song, album, artist etc), from there you get a popup and do what you want with the selection (play the selection now, create new playlist from selection, add to the curreny playlist etc.)

I agree, the default behavior depends on which category you have selected. My usecase is pretty simple, I usually just go to a directory I want and play everything from there (usually while driving) and skip what I don’t like, so I never really thought about it.