It's also because they fucking suck at managing complexity. Almost everything they make is fourteen arbitrarily named editions of the exact same bug-riddled trash we know and love. 365/Azure/fuckingentrawhat are barely usable. It's almost like they specialize in UI synchronization bugs - but I remember this being a problem even with Windows 3.1.
I realize this isn't a particularly hot take on Lemmy, but let's not pretend that all software is equally deficient - because there absolutely are better options.