You're describing built-in developer tools for editing local files during development. The comment you're replying to is describing the vision of a browser which can edit remote files as part of the normal user workflow, not as a developer-only activity.

NeXT machines were hardly mass market user machines... They were almost exclusively developer machines.

Also Chrome does have stuff like SSH extensions.

That being said, some of the computing paradigms of the 80's and early 90's were very cool and I wish they caught on... Lisp machines, Smalltalk, early web ideas were interesting...