As well as band work, I play bass at a regular set of guitar-oriented jams. Drums, keys, bass and then up to 20 guitarists swapping in and out on different songs. They pick the songs beforehand so we can learn them.
I get to learn a massive range of stuff - and some of the choices make me groan at first. However, once learned, it gives you a totally different appreciation for the song.
This weekend coming they have picked “chasing cars” as one track. Lol, I thought - that will be a piece of p1ss.. but no. Yeah so it’s not technically complex at all, but the timing on the bass is so crucial it’s given me a whole new understanding of “in time” 🤣
I would say that learning as much stuff as possible really gives you a better understanding of how to learn - both efficiently and accurately