That’s… not a valid point. eMacs whole point is being “malleable”, but the point is that not every software has to be, and they never have been by default.
... but the parent makes a good point that software can be malleable, and that it's a good thing.
Its quite reasonable to assume a future operating system could take on the malleability of emacs? That would make it the default. Just because it hasn’t doesn’t mean it can’t be.