Have we gotten an answer yet to whether or not you are a professional musician.
Are you?
If you aren't, then you simply don't know what the requirements of a professional are. I think this is the case and all your yammering about philosophy, psychology, and quasi-religious thought are practically meaningless when held against the experience and necessities of a person who actually makes their living through music.
And, of course number of basses has no correlation to the quality of the bass player. That's a straw man you just set up there and no one in this thread has made that claim.
However, it's a near certainty that the bassist that can pick from a variety of instruments to satisfy the whims of a recording engineer or producer is far more likely to get future recording gigs. And, to a somewhat lesser extent, having the "right" bass for a given show, gig, production, etc -even if it's just for appearances- is going to keep your musical employaoverkill and of coure its ensure future gigs.
Enjoy your one bass and bond with it all you want, but you're way out of your depth here with this incredibly presumptuous idea that you know what's best for a professional musician.