I learned to read sheet music through orchestra all through my school years. For playing guitar, I found it wasn’t worth the effort. The keys were usually selected for compatibility with other instruments. I never liked playing in E flat or B flat but that’s how sheet was scored, usually.
On the other hand, guitar folks liked G and A and so on.
So, their A, with 3 sharps became B with 5 sharps for me to accompany on a trumpet.
Big change after that orchestra scoring like you said. Usually never had more than 2 sharps there.