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It's not that simple. Until literally 3 days ago I held exactly your same view "why don't they just become Apple authorized repair shops?" Well, apparently Apple actually restricts the repairs you can do. For example, if you have water damage, you aren't allowed to just fix the actual components (capacitors, etc) that blew, you have to replace the whole board, resulting in much higher costs and eWaste for customers.…
I have another not-very-green issue: my iPhone lightning port is wearing out. Apple will not repair it in their own shops. At least they don’t seem to try to prevent third parties from doing it. This is especially surprising given the unusual design of the Lightning port. Most ports (e.g. all USB variants) put the parts that are likely to wear out in the cable. Lightning has them in the jack, which is why the cable i…
I fixed this just by using a plastic flosser to pick the lint out (you could use a paper clip, but I opted for the somewhat-softer plastic), then some canned air to get rid of the remaining bits.
Went from "oh god, I gotta go to the Apple store" to connecting with a SNAP again, with a seal tight enough to support the phone's entire weight.
I hope that this is just your issue, because it's very easy to fix, even if diagnosing it is a bit tricky.