@surelycantjustbeme - apologies, I've just re-read that and realised I didn't properly answer the questions you asked.
No, I probably wouldn't feel the same kind of relief, because to describe them as separate conditions would be a false distinction made for social reasons rather than medical/psychological reasons, and that would just cause further problems as - like I said - the variability of the condition would make dealing with medical services much more confusing and difficult than it is already.
Say, for example, that we were using the old definitions - "Aspergers" for level 1 and "autism" for levels 2 and 3. I would've been diagnosed with Aspergers...OK, fine. However, one of my major sensory issues is to do with my teeth; I've just had a dental treatment plan drawn up in which I have to have a couple of fillings. Anything like hygiene treatments, or drills, increases the risk of me having a meltdown to an almost certainty, in which I lose all physical and mental control.
Now, meltdowns to that degree in adults aren't part of the Aspergers condition. How am I supposed to explain to the dentist, and my GP, that yes...I have Aspergers, but if anyone puts power tools near my face then it turns into autism? "That's not possible", comes the answer, "because they're different conditions". The result? I don't get the right sedatives, and I wig out in the chair when someone's got a power tool in my mouth.
However, since I have an autism diagnosis, all I needed to do was go to my GP and explain the problem, and I got the exact right treatment with no further questions asked.
This is the kind of thing that never seems to get a mention, usually because autistic voices aren't the loudest. Without this, though, we often just avoid things like health and dental services because we can't make ourselves heard and it feels like too much of a risk.
"Or do you feel that the greater information and acceptance surrounding autism specifically has made a difference?"
Yes, it's made a massive difference - I've seen it change even in just the few years since my diagnosis. These days, I have to explain much less. I've changed jobs a couple of times since then, and accommodations at work are much easier to come by now than they were even five years ago too.
Outside of that, folk seem to treat me much less like a live snake when I tell them (which I only do if it seems necessary, or if I think I'm going to make them uncomfortable without that common knowledge). I don't get as many strange looks when I'm wearing shades in bright shops, or wearing my earbuds in environments most people wouldn't consider noisy. Haven't been pointed at or called a weirdo/freak in three or four years now.
Also, apologies for the verbosity. Brevity, as I'm sure you're aware, isn't often an autistic talent ;)