> why the hell does a TUI need to run in terminal React by way of JavaScript

Because React is the only UI framework that takes the problem seriously. Everything else is stuck in the dark ages.

How HN gets this so badly backwards I'll never understand. Everyone on this site talks a big game about "there shouldn't be so many competing tech stacks, why can't everyone work together on one framework that does things right", and then as soon as that framework actually appears this site hates it more than anything.