[opan]

>you could actually just exit Windows entirely, or just skip booting into it and what you would be left at is a plain real mode DOS environment.

That sounds handy. A bit like the TTYs on most unix-like systems (I don't think macOS has them).

[p3n1s]

It's really nothing at all like that. TTYs are the core interface of all terminals in *nix including the one you would use in any X11, Wayland or other graphical environment, those specific incarnations using something called psuedo-ttys but its all the same stuff in the kernel.

What you really mean are plain text mode consoles for which most UNIX likes further extend this to allowing multiple "virtual" consoles to share one display. And MacOS does have text consoles (see video_console.c in the darwin source), they are just not usually used and very hard to get to especially in Apple Silicon era macs (older macs can easily be booted in single user mode with Cmd+S)

But this is still not at all analogous since it's still the same OS underneath. Windows 95 family was a virtual machine manager launched from DOS so booting into DOS means not loading it at all. The issue for compatibility wasn't so much the graphical shell part as the VMM (virtual machine manager).