It doesn't really hurt anything, especially with Apple's purchasing power. The "pro" in there means something to a lot of people, if you are doing a live DJ set and your laptop crashes it can be catastrophic for instance. Rare, maybe, but yes studies confirm bit flips are real and at 32GB you are going to see them a few times a year. A DJ isn't going to necessarily know that adding $50 to the BOM and $100 to the purchase price is worthwhile, but a company like Apple is one of the few that can make good design decisions like this for their users.

Also the caches and data buses in the very same computer are all ECC protected. This is basically intel propagating ignorance, and Apple not stepping up. They whiffed on APFS and data checksums too.