Yes; the key issue is that too big a % of the GA community is so tight you could not get a #1 pozi up their sphincters, with getting half a dozen quotes etc, and anybody in maintenance has to scrape a living off that... somehow.
That prevents firms offering a decent service.
It also prevents them operating a decent level of project management (meaning... most do what most builders do and take on several jobs concurrently knowing they can't do them all concurrently so they work on those whose owners scream the loudest).
One way out of that is to aim for the Cirrus crowd which mostly drops the plane off with a pre-signed blank cheque and the keys left on the seat
But there is an underlying issue with a high % of shysters. I dug out more shysters in 1 year of GA ownership than in 34 years of being in my own business in electronics. I get by by micro-managing everything, but many/most owners can't or don't want to do that. I don't think there is a solution. I know of firms who are very good for certain types of work but crap for others.