By comparison, I wouldn't consider VS Code a "simple" UI. And replicating it with Qt, GTX or anything else would be a significant endeavor for even one platform, let alone three very different platforms. They all have serious flaws. As a user, I'd rather have something useful now, than wait a couple years hoping to maybe see a linux or mac release of a program.
To each his own, of course, and if VS Code does it for you, well then - excellent.
I personally find it a bloated mess, and like to stick with my Komodo and my Geany - two neat examples of portable UIs done right.
Anyway, I'm sure there are ways of embedding runtime web macinery in somewhat less than 100Mb. Twenty years ago I did so in a megabyte or two, admittedly without the js.
