"NT" is only useful if it's used in a way the listener understands and agrees with.
The problem with the term is that some use it only to mean anyone that is not on the Autistic spectrum. That usage would mean that someone who is ADD, ADHD, or any other DX, but NOT DX'd with anything specifically on the Autistic spectrum is "NT."
Some tough, use it to mean only people who do not have any neurological or psychological diagnosis.
So it can be confusing if you use it one way, and your listener interprets it differently. It is important to be clear how you mean it.
The same sort of problem happens with the term Autistic. Some only use the term to describe severe Autism, and don't consider mild Autism or Asperger's as Autistic at all.
It's a problem with many other terms as well that have nothing to do with Autism.
We aren't the only ones with this type of communication problem. Unfortunately, it's all too common.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...