"Ah, can you fix my flat?", he said. "Why yes sir, that will be $7.50 plus the cost of a new tube." comes the reply. This and other repairs are what helps keep the bike shops in the black. Now on downhill bike we would charge $15 for the labor, those tires can be very hard to take off not to mention having the through axle to deal with.
As far as not being able to fine tune modern equipment. I find that you can fine tune it so that it is so sweet to ride you don't have to think and fine tune so much when pedaling. If you understand limit screws and their function the rest is pretty easy.
Mark Poore In rainy Slatyfork, WV
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