Charlie99 once bubbled...
How many of these people do you trust?
the guy that serviced your regs
the guy that changed the filters on the compressor
the guy that ran the air quality test
the O2 analyzer manufacturer (you DID test your tank to make sure that it REALLY is AIR didn't you?)
the boat captain that picks you up after a drift dive
And by adding the boat guy to the list you add another link in the chain. I like to cut out as many links as I can. You're right, I can't get rid of them all. It only takes me about 3 minutes to assemble my gear. It's time well spent for me.
If I drop the first stage into the sand without the dustcap on, I'm pretty sure I'm not going to dive with that reg until I get it looked at (yes, by someone else ). If the boat guy drops it, maybe he doesn't think it's worth the hastle to tell me.