Don't really agree this means anything
All this means is that everyone is doing what everyone else does based on what everyone wants. It was the case 20 years ago and will be the case 20 years from now.
It's like jelly in the stores. Everyone has strawberry and grape because those are the big sellers. So, there are 20 brands of strawberry and grape. After you get strawberry and grape on the shelf, leftover space goes to the other flavors.
Everything on port 80 or even port 443 is worrisome though. Firewalls definitely have to be smarter now than just port level traffic.