EXWM/Fulltime Emacs user here... Well... No, ansi-term, sane-term etc are not like regular terminals, they can work for simple things but they are limited, limiting and buggy...
When I start living in Emacs I reduce significantly the dependency of the shell (tramp and dired do most of the business) and start using eshell a bit, but I still use terminator when I need a real terminal...
For all its flaws, the VS Code terminal is quite strong. I've been putting it through its paces recently and if only they'd offer an option for real full screen and proper splits, it could almost get all the way there.
When I start living in Emacs I reduce significantly the dependency of the shell (tramp and dired do most of the business) and start using eshell a bit, but I still use terminator when I need a real terminal...