TL;DR Add a “Resume” option to the Play button drop-down menu
Listening to albums and playlists is often spread across multiple days and endpoints. When using Roon Remote on my laptop or iPad I can figure out where to resume based on the track play count, but that doesn’t work on iOS because the track play count is not available. If there was simply a “Resume” option on the Play button drop-down menu that queued up any unplayed tracks then my problem would be solved
Perhaps I am misunderstanding your problem but why can’t you just transfer the play queue from the last endpoint you stopped play at to the one you want to listen to? I too listen across multiple days and endpoints but starting where I left off is never an issue. I mostly listen to albums not playlists though.
While that works with an active queue, it doesn’t work if you play other stuff in the meantime and then want to continue an album or playlist later.
It makes sense to me. Many playlists are several hours long (Qobuz 500 Best Rock Songs, and similar) and it would be nice to continue where you left off. I think there is an existing feature suggestion topic for this, though.