Problem is that with the bike industry it’ll be very easy to take the piss and charge 2 hours labor when it only takes half an hour to do the job. You only need a couple of shops to do that and the whole thing comes down.
Auto industry has huge workshops where people actually DO the job, and work out a precise time, parts list, operation lists. So if some one charges too many hours they are either incompetent, or crooked. So they get investigated and/or not paid.
The bike industry simply doesn’t have that level of sophistication (or enough money/legal clout/decent contracts) plus some shops don’t have dedicated workshops/mechanics, so who knows how long the job took, lets just bill them for the three hours the bike was on the stand and the mechanic was also fixing punctures and selling a kiddie bike…….
And the fact that the mechanic at Specialised (probably one of the few that could afford to do something like that) with a huge rack of extremely expensive tools in a clean workshop, a brand new bike and the absolutely correct parts can do the job in 24 minutes doesn’t translate well to some of the horrendous dumps i’ve seen with barely mechanically literate “mechanics” and a bike that needs a 30 minute clean before you can even see the problem, which is under 10 mm of rust…….
As an aside, when i google for “Chaotic bicycle workshops” why do i get 50 pictures of absolutely immaculate workshops where you could eat your dinner off the floor? Has the meaning of chaos changed since i moved away from an English as a first language country?