I believe Figma is indeed written in C++ and uses emscripten. It's pretty much the polar opposite of your standard CRUD app.
Old article: https://www.figma.com/blog/webassembly-cut-figmas-load-time-...
Old article: https://www.figma.com/blog/webassembly-cut-figmas-load-time-...
So neither of those are a good argument in favour of these complicated javascript stacks, are they?