“You don't have to imagine it. You can see it here [1] or just download a Smalltalk system yourself.”
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I have been using Emacs as my daily driver for about a decade. It's the closest thing we have to a "popular" Smalltalk environment. The desire to bring everything into Emacs is the same desire I felt after experiencing what computing could be in Smalltalk. One of the really striking things that you're confronted with in a modern Smalltalk is the Morphic UI system. Imagine that, with one click, you could drop into a new window with a live inspector and a (very freeform, repl-ish that's not a repl) REPL loaded into the internal context of any button, window, pane, scrollbar, you name it that you can see right now. (Even my own vocabulary is stifled with the traditional UI/UX we have now!) Now imagine you can do that on any application on your computer. Now imagine you can drag those subcomponents around, rearrange them, drag them onto new windows, modify their code, spawn new ones, and so on all while the thing keeps running and functioning . If you break something, it's okay. The debugger pops up and allows you to do the same thing that you did when you inspected the widget for any point in the frame in the stack trace . Yes, you can debug, live, multiple levels of your stack trace at the same time, that have live, editable versions of the code as well. You don't have to imagine it. You can see it here [1] or just download a Smalltalk system yourself. If the Smalltalk community focused on building some tooling to allow you do develop other languages inside a Smalltalk image ba