Re:
The thing is if we started on 24" wheels and then used 700c because road bikes use them and then so did cross country (be honest it's the only reason they went for that size)
Then the middle group, the lefect size as they say would be different.
Or if they had stuck with the obscure 650b size at the start we'd have another middle size.
I still think, grow the wheel size with the size if the frame.
Not that that has stopped BMX bandits from riding kids sized bikes with kids wheel sizes.
Honestly wheel size does not matte unless the biek gets too big or too small for you. It's the rider riding it in the end.
And we all know early 80s/circa 90s/mid 90/late 90s/these modern fangled circa 00s bikes* make you happy.
*delete as applicable