I think it just doesn’t occur to companies of a certain size. I was similarly flummoxed when my current job also assumed I was BYOPC, though they acquiesced to buy me a Mac when I asked. But, the rest of the team still uses their desktops and (!!) has trouble when traveling and being forced to use an alternate development environment.

I was baffled when a large global consulting firm had me use my personal laptop and iPad (which they filmed to show off my work to other clients) for a month before getting me setup. And that was in 2018, I was desperate for work at the time.