You know, Ive NEVER seen a bass player play anything past the 12th fret, with the exception of Cliff Burton who used to play bass solos a lot, but then he never went past the 19th. I dont see the access really being a problem.
then you've only seen a bass player not a bassist
check Victor Wooton, Les Claypool, Jean Baudin, Billy Sheehan...... My friend hates only having 21 frets, he "needs that high E"