For music I’m just sick of the apps streaming super compressed crap. It sounds like 192kbps MP3 sometimes and you can definitely tell the difference. Setup Airsonic and never looked back, although still have YT music for the fam and finding new music. It is a bit of hassle, but it’s worth it and a FLAC collection feels way smaller than it did 10-20 years ago (both in terms of disk and home streaming bandwidth).
They don’t, but they define the socket the processor slots into and probably did this to market the newer chips as more advanced than they are (by bundling a minor chip upgrade with an additional chipset upgrade that may have more uplift).
I see no other reason to kneecap upgrades like this when upgrading entails the consumer buying more of your product.