Why is it so unreasonable to expect the use of a torque wrench when dealing with special materials? Ask an aircraft mechanic whether they are allowed to just torque fasteners by feel. My brother-in-law is a miltary aircraft technician, primarily working on helicopters, and everything has a specific torque spec. If you like to take your car to local track day events (autox or road course), it's always a good practice to check lugnut torque because over torquing can result in broken wheel studs. I've seen subframe locking bolts sheared off due to being overtorqued.

I don't think it is unreasonable to expect bike shop mechanics to utilize torque wrenches when fastening parts on a carbon fibre frame. I personally use a torque wrench for everything I do on the bike and, from my experience, you have to be fairly aggressive when tightening a fastener to crush a carbon fibre component.

I've also seen mechanics use grease on a bolt and then attempt to torque it to the same dry-rating as a non-greased bolt. Not good and this can result in overtightening.