Because it would be really really dull if we were all the same.
We value different things, we have different histories and have taken different journeys. Which is cool because it’s that that’s driven us to the current generation of devices.
For me, as a PC developer at work, after a decade or so of ‘bringing my work home’, I wanted something different at home. I started off with various Linux distros but too much hassle for the other half (this was 2002), so went for my first Mac (
https://en.m.wikipedia.org/wiki/IMac_G4), still works today, although useless
I’ve stuck with the Mac at home, PC at work since because it gives me separation and that’s important for me, plus to an extent I’ve built up a bit of an eco system that works well together. We do have PCs at home too, 4 current ones (wife and three kids) but I like my Mac!
PC’s offer a huge amount of flexibility, and the OS is pretty good now, that said we’ve ditched them at work now, preferring ChromeOS/Chromebooks