Did the Windows 95 setup team forget that MS-DOS can do graphics?

One of the reactions to my discussion of why Windows 95 setup used three operating systems (and oh there were many) was my explanation that an MS-DOS based setup program would be text-mode. But c’mon, MS-DOS could do graphics! Are you just a bunch of morons?

Yes, MS-DOS could do graphics, in the sense that it didn’t actively prevent you from doing graphics. You were still responsible for everything yourself, though. There were no graphics primitives aside from a BIOS call to plot a single pixel. Everything else was on you, and you didn’t want to use the BIOS call to plot pixels anyway because it was slow. If you wanted any modicum of performance, you had to access the frame buffer directly.
↫ Raymond Chen

And with everything the Windows 95 setup program needs that you’d have to create, you’d end up just… Developing a custom operating system in the first place. Since Microsoft already had Windows 3.x lying around, why not reuse parts of that to aid in the Windows 95 installation process? Honestly, all of it makes perfect sense, and I really don’t understand why anyone would seriously advocate for building a separate, entirely custom operating system just to install Windows 95 when Windows 3.x was right there.

Of course, these days things are a little different, but Windows still loads a different operating system during its installation. It’s called the Windows Preinstallation Environment, but it’s no longer based on Windows 3.x, obviously, and instead is a cut-down version of the Windows version you’re actually installing. The latest version of Windows PE is 10.0.26100.1, and it’s built from Windows 11 24H2. Windows PE also powers the Windows Recovery Environment, the menu you can boot into to perform various analyses, maintenance, and repair of your Windows installation.

Since Microsoft does not want Windows PE to be used a general purpose operating system, it comes with a few interesting limitations you can’t really circumvent. It has a non-configurable 72-hour time bomb, after which if will just shut off, and since PE runs entirely in memory, no changes are saved – unless you make any changes during the creation of the PE image. It also makes use of FAT32, so there’s a whole host of limitations there, and there’s a few other things Microsoft disabled. Since you an add drivers to a PE image, though, I wonder if you could sneak in a file system driver and circumvent FAT32’s limitations that way?