Bootcamp was a hedge when Apple was a lot less dominant than it is now.

When Apple transitioned from PowerPC to Intel, it wasn’t clear that was going to work. Being able to boot into Windows was sort of an insurance policy that’s no longer necessary.

It made migration from Windows to Mac easier. Now that Office can run in a browser and the Mac has first tier support for the desktop version, and a lot more of the usual software is delivered either as web applications or portable apps on top of a browser runtime, being able to boot Windows is a lot less relevant.