If you have to tell people that "+ X" doesn't mean "add X", there's something seriously wrong with the definitions your game is using.
It's a game terminology, and we used it for literally decades without any issue. No one I knew had issue with it, but I imagine they are out there.
It was based on the systems people knew at the time, so it worked for them. Otherwise, they wouldn't have done it.
Anyway...
I missed the THAC0 the Clown thread, never bothered with the book he came from, so didn't even know about him until this thread.
No, not funny at all. Pretty insulting, actually. Shame WotC, shame on you. This is clearly mocking and meant to be so. WotC gets knocked down another peg IMO.
THAC0 was a system and there was
nothing wrong with it. It worked. For many years. Ascending AC is another system, and it works as well. And guess what? People STILL have issues with Ascending AC. Of course some people had issues with THAC0, claiming otherwise is completely delusional, but Ascending AC isn't better, isn't worse, it is just different.