Since we aren’t talking about the Sun (proper noun version), are you talking about using ‘sun’ (the common noun version) as a replacement for any star, even though it’s not orbited by planets?

If so then yeah that’s it’s weird.

But isn’t ‘sun’ (as a common noun) already being used for a rather long time to describe stars with planets, in popular works, and have such characters in such works mention is as the ‘sun’ (common noun) of that planet etc?

I don’t think I’ve seen anyone here yet say that ‘sun’ is a straight synonym for ‘star’, especially lonely stars with nothing orbiting it.

Like, if you see binary stars and nothing else in that system, we don’t call those ‘suns’ right?

I think you assumed that I was using ‘sun’ as a synonym for every single star?