I would be very happy if I could use Emacs’ text editing and text manipulation/navigation everywhere. Things like a real IDE with an Emacs editor. Or the IDE

I would be very happy if I could use Emacs’ text editing and text manipulation/navigation everywhere. Things like a real IDE with an Emacs editor. Or the IDE being controlled by Emacs. Or a desktop manager controlled by Emacs. That Emacs lets you design a great user interface is exactly why some people want to “live in Emacs”. (Similar to how some misguided souls prefer to “live in the terminal”...)