I don't think it's particularly common. When I went through my dx, I was really hoping for adhd because then I could get meds, but my doc and all my screenings were like, "definitely not adhd, definitely autism".
So, maybe you are seeing rising diagnosis rates and considering that too easy? If encourage you to think about why you feel this way.
It's not about the rising rates, that could be explained in other ways.
The diagnosis is a road to help. I doubt many people travel down that road without there being some merit to their ideas, but even if it is the case that lots of people travel down that road, that doesn't say great things either. That just means we have a giant group of people screaming out for help and they are using one of few outlets to try and get it. I'd rather they get that help through travelling down that road than blocking off the road to anyone isn't 'actually ill', whatever we define that as.