Maybe because it's not ambitious enough? Nix (and NixOS) does most of the same things, and then some, achieving more of the potential benefits. If you're going

Maybe because it's not ambitious enough? Nix (and NixOS) does most of the same things, and then some, achieving more of the potential benefits. If you're going to break compatibility anyway, you might as well do it in a big way. A 2x improvement isn't enough to be worth the cost. 10x might be.