There’s a world of difference between default, but optional, immutability, that can be freely augmented with admin privileges and a bit of learning; and a full on lockdown that’s tantamount to DRM that requires a person to make unsupported and security-compromising modifications to their entire system to bypass.

Also “the future of…” anything reeks of cult of inevitable progress. Things move and branch multidimensionally, and trying to shoehorn all systems into being the same is just pathological.