This finally occurred to me the other day. NTs can just have a conversation without putting in to much effort but for us it requires concentration. Casual small talk becomes a chore so we get tired off it and try to get out of the conversation. This isn’t something NTs can understand since they don’t have to put thought into talking and acting “normal.”
The possible exception to this is when Autistic people talk about special interests. This creates dopamine in the brain so we basically become high.
Just because an NT doesn’t experience the same challenges, doesn’t mean they couldn’t understand. Some won’t, others will.
I think it would be very hard to be deeply empathetic. (Thus the double empathy problem)
They can conceptually understand but to do more than that they would need to experience life though a different lens. The same thing goes for NDs knowing what it is like to be NT.