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You also have tons of experience. Would you agree with the other basic statement I made: "In the end, I think Mario has it right: send your audio in the best quality they accept..."?

Yes, absolutely.

For ideal results, the goal should to learn what that "best quality" is for one's most used platform. That said, AppleMusic standards are not going to cause problems with most services and platforms. Those of us who master for clients need to know their exact needs and have the tools & experience to use them. I posted a couple of mine.

In the extreme example I cited, I drove the couple hours to the K-Love broadcast HQ to get an exact rundown of their technical specs. Having had a Class 1 FCC license in my background when I managed a 10W FM station didn't hurt (yeah, I speak broadcast-geek). That's a market of 520 stations and translators—artists who get regular play reach an estimated 20–30M listeners not counting internet.

BIAB 2024 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5