Segment overrides were also painless to use, a single byte segment prefix byte was all that was needed to revector a memory operand to a different segment selector for the next instruction. With bank switching you'd have to use extra instructions and/or registers to switch the banking window to the desired bank and back, and possibly bounce to a routine in RAM to do that if you only had one banking window (which was quite common).

Banking registers also weren't always readable, in which case either you'd need to shadow the banking register or avoid nested/interrupt scenarios.

I'd prefer 8086 segmentation any day over the headache of trying to execute 6502 code from a bank-switched cartridge with a single banking window and a write-only banking register.