What do we all have in common?
And even those traits you no longer present are still there "underneath it all" -- or at least the triggering cause of those traits is still a part of who you are if I'm making sense. As you say, you've just learned skills of accommodation that allow you to "read" as NT. But it doesn't make you NT (as you obviously know.)
It's really no different than, for example, Jodi Foster's performance in the movie "Nell." In that movie, Ms. Foster "read" as a particular sort of person (raised in a very isolated environment and learned to speak from a mother with stroke-induced speech impairment) but just because the movie "Nell" was very convincing doesn't mean Jodi Foster was no longer a modern, assimilated, urban woman -- underneath the "Nell-ness" was still Jodi Foster just as underneath an Aspie's ability to "pass as NT" is still an autistic person.
This is part of the difficulty with adult diagnoses, as well. Over the decades, we continue to develop (albeit on our own, non-NT timetable) and we continue to devise personal accommodations and work-arounds until we often do not look as autistic as we did when we were children. But it doesn't mean that the non-mainstream neurology is no longer present "underneath it all."
It's kind of ironic: I sometimes hear people describe those with autism as being "trapped inside the autism" and family members and professionals are trying to "release them" but they dont' seem to realize that what they are doing is actually wrapping new layers of behavior and accommodation around the genuine autistic. They see the new creation and say they have been liberated (and, in fairness, perhaps in many ways the individual has been liberated from many things) but what they're actually looking at is an autistic person inside an NT-approximating shell.
Sparrow
Funny thing is that how after years and years of being exposed to (social) interaction this way or the other, it never really becomes the part of you (at least in my case). I may get it "right" 2 or 3 out of 5 times, but I'll never know when I'll screw up (and I know I WILL screw up eventually).
It's like learning to drive a bike over and over and over again, and you never fully master it, there's always a chance of falling over.
I can't pinpoint one thing we all have in common. Maybe that's the reason it's called a spectrum - each of us is somewhere along a spectrum of symptoms but not necessarily close to each other on that spectrum. I just read about a book written by an Aspie to share their experience and help other Aspies. From the background of the writer, I can see that we didn't have any experiences of AS in common in our lives, nor do we have the same limitations related to AS at all. And what do I know about helping people with LFA? I have a lot more in common with NTs than LFAs. So I think the spectrum is too long and wide - more like a recycle bin where everyone puts whatever social or functioning symptom that doesn't fit anywhere else. All the many organizations that claim to help "all people in the autistic spectrum" - I wonder how much their managements actually know about the other syndroms on the spectrum apart from their own / their own child's. I was at an event "for everyone on the autistic spectrum" where the LFA were totally ignored and left to wander around helpless - the management insisted it's FOR ALL the autistic spectrum, but they had no idea (and I don't know if they'd ever seen) about a LFA person. It's a party, in fact. So many people talking (and some even writing and lecturing) about a spectrum they only know a tiny segment of.
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So-called white lies are like fake jewelry. Adorn yourself with them if you must, but expect to look cheap to a connoisseur.