As above really depends on brand/make,
A good bike shop will/should check every thing. more often than not it needs a tweak somewhere.
When I first started at a bike shop many many years ago, a new manager got us to strip the bike, check/grease BB,, hubs, headset etc. and this was on crappy universal bikes!!! A high end bike I can understand, but a cheap nasty thing was a pain in the ass!
I do know of some shops that still strip high bikes and check it all.
I am with Trail Rat, on his outlook, if I not happy to ride it it don’t go out the door.
had similar last month when selling a bike, customer wanted shorter cranks (to be the same as his other bikes) and I replaced them for him, FOC. I think he could replace them himself correctly but I feel it something we should do, help with any issues on warranty, gears working etc. also it the kind of customer service we try and deliver.