Honestly as far as hiring for this stuff goes, this is more in the “cute” category for me rather than the “annoying” category.

JetBrains brand Integrated Development Environments

I’d imagine it’s because people who use spaces are either further in their career in average (because the modern programming ecosystem in general uses tabs so new devs are more likely to only know that) or they’re just more serious about software development because the kind of person to die on that hill is also the kind of person who is very obsessive about other things as well.