But an editor is something where you navigate for a long time, whereas the average web page navigation is brief. In 99.99% of the cases, it doesn't make sense to attach a (complex) keyboard interface to it, and a specifically vim-like interface even less.

> When all you have is a mouse everything becomes a click, and that is a horrible way to input data.

Quite a few people access web pages via a table or phone. Touch is often easier than a mouse (not always, though), and can also outdo a keyboard.

I think web-based TUI is a very small niche. Large-scale data entry might be about the only place where it could work, but then you'd want a highly tailored, ergonomic, user-friendly interface.