I suggest you watch some videos by Louis Rossmann on youtube to understand the problems with Apple's repair policies. The problem isn't with Apple certified repair shops, but with independent repair shops
Louis definitely knows his stuff and has the technical knowledge to repair devices and probably doesn't need to be certified in any way. The number of people that have the skills Louis does, though, is vanishingly small.
So, in his case, Apple is asking him to pay money every year to be certified in something that he likely already knows how to do and is not willing to send him parts to do the repairs he knows how to do. That's a reasonable position.
From Apple's perspective, though, Louis is the exception and they want everyone certified. To them, Louis can easily get certified and join their program and there's no need for them to not enforce the same policies for all repair shops.
The issue lies in the repair shops that don't have the skills that Louis does. Apple wants to make sure that repairs done by those people, who are in the vast majority, are done to a certain level of quality. It's the same reason why they replace full components instead of opting for board repairs like Louis is also able and skilled enough to do. For Louis's customers, they'd get a great repair and a reasonable cost. For everyone else, they'd get a subpar repair for the same cost.
He does try to justify his vitriol, and it's obviously one-sided and he makes no bones about it. Apple, being a big corporation, won't provide a candid response to any of it.
So, agreed to the extent you'll definitely understand that repair shops are feeling the pinch and have a clear idea of why that's happening from their perspective. But you'll still be missing an understanding of the challenges a large manufacturer faces trying to run an authorized service provider program.
All I personally know about it is what I've seen on here, but it does seem like it's worth being a little skeptical about what Rossmann has to say about Apple.
Personally I always root for the underdog, they have less resources so it's harder for them to fabricate information.
Sure, just like it's good to be a little skeptical about what anyone say.
Rossmann isn't a liar though, what he say about Apple is right. You may thing he avoid saying positive things about them (but I did hear him say plenty of positive things about them) but that doesn't make what he say about Apple false.
And he actually praises Apple quite a bit as well, in areas where he thinks they do well, such as their trackpads.