Hardware key storage is a low level security primitive. Both Android and iOS have mandated it for far longer. It's a low level security primitive that enables a lot of scenarios, not just DRM.
For example - it's not possible to protect SSH keys from malware that achieves root without hardware storage. Only hardware storage can offer the "Unplug It" guarantee - that unplugging a compromised machine ends the compromise.
9front with factotum tells a different story.
If you want to protect keys you get a yubikey or something like that.
And if you want to play sound, you buy a sound card. Computers integrate components that approximately everybody needs. Hardware storage for keys is just the latest example
Ah yes Android and iOS, they have truly become bastions of user freedom since mandating secure enclaves. That really puts my worries to rest. /s
User freedom is not the only axis by which we judge operating systems.
It is not, but to me personally it is a very important one and it is not one I will give up without a fight.