Officially, it didn’t, but actually it did. Officially it was the OS updates that made everything incompatible (and it did make more than half of my steam library incompatible) but it was those OS updates that were needed to support the new arm hardware.

So look at it however you want I guess, but there are a bunch of 5-15 year old games that run just fine on my windows PC, but no longer launch on my iMac. That’s not impressive backwards compatibility.