Right, I sort of understand that (not the details). I'm sympathetic to the kitty author, who explains why other terminals and tmux are doing things wrong, etc.

I guess it is especially messy in the terminal, reading a little bit into the issues and it just feels like a ton of legacy hacks between different implementations.

And comparing that to the browser is interesting. Both are "ubiquitous"—terminal emulator for cli/TUI, and browser for GUI. May be because of there generality / ubiquity, it is messy and impossible to "make it right".