Terminals are full of legacy bloat, but TUIs don’t have to be. I don’t think Borland IDEs used ANSI.SYS.

How is graphical vim even different from TUI vim? At least Emacs can render images.

Even 68k-based systems running in single digit megahertz could run full featured terminal emulation and have a lot of other stuff going too. There's legacy stuff in terminals, but compared to all the other stuff you've got going (Wayland, GTK, frickin' browser engine) it isn't bloated.