Hm, we weren't saying the same thing though!
(LRD, did you mean "understand" or "be understood" as you wrote, in your last post on this?)
happy to leave it if you prefer, but although I think you are right in the sense of describing a perfectly acceptable model of coming to an understanding, I have a curmudgeonly sense (paranoid? Me?) that limiting the terminology can limit the discourse and can be used sneakily to disallow certain concepts. Or delay them. Hold them up. Introduce charmingly expressed red tape, smile winningly while battening down the hatches.
Imagine talking to a "sweet" old buffer who refused to use "SAHP" and said "I just can't get used to it. We called them housewives in my day". If you accept his rejection of "SAHP" there are certain ideas you just can't have. He might - however unconsciously - be doing it deliberately.
And "Agh! Scary language!" often means "Agh! scary ideas!"
If you think about how we get language, I just don't accept that the only way to manage is to sit people down and say "here is a Book. Here is a Ta-Ble.". This is not how we learn any language, least of all our first, which will become the most fluent and the most natural. You get mothers saying "are you hungry? Do you want some milk now?" to minutes-old babies. When this happens you don't get other people saying "don't intimidate him! He doesn't understand those words!"
Sometimes you have to just jump in and read.
I was privileged to play instruments with people a lot better than me because I learnt an unpopular instrument and got into some rather posh ensembles, where the flautists, for instance, had fought off tough competition to get in. I shut up and listened a lot, and did my best, and tried not to get in the way. It was bloody good for me. I was intimidated sometimes and it didn't feel good. but what did feel good was being a part of something so good. I could have said "I resign. I'll go back to Junior Wind Band" and that would have been easy. but I didn't want to.
Nor did I say "can we just play something I already know from Junior Wind Band?"