Realistically this sounds more like some plumbers are concerned that Sharkbite is taking some of their business. There was a need in the market that Sharkbite filled. Most people will still call a plumber for something like this. Many will get ripped off, some will not. Regardless, this is a valid option for the homeowner to use. It is a permanent solution in spite of you saying it is not. Sharkbite meets all codes for permanent use including sealed up in walls. I have used it many times myself (in addition to being able to sweat pipes) and have never had a single issue.