Its true. The fundamentals some are losing some are advancing. Look at the 2 basic fundamentals in basketball: shooting and dribbling. It has evolved so much.
Shooting has gotten better and thats fundamental. We criticize people modern day because they lack the fundamentals of the 50's or 60's or even the 90's. But Players learn and perfect the fundamentals that are best suited for there era.
Imagine steph curry coming around in the early 70's. He would not be who he is you know why? Cuz part of what makes him so great is his shooting/range. If steph curry shooting 30 jump shots in the 70's you know how many points it would be worth? Just 2.
Does that mean curry would be ass or avg? No, he would just have to perfect other fundamentals. Shit far as we know he might have been just an avg shooter because he would not have put in the practice and time to be such an elite 3 point shooter. But he would have found a nitch somewhere.
Meanwhile people like kyle korver who is just a role player and nothing more if he played in the 70's he probably would not make the nba because his value is shooting.
There are certain fundamentals that transcend any era of basketball.
I mean do you expect these kids to perfect the sky hook shot? That fundamental is way more important in the 60's than in the 2000's.
Some people play in the best era they could have played in.
Imagine Rondo playing in the 60's
Now also imagine lets say Jordan playing in the 70's. He would have been great regardless just like LeBron but i think Bron would have been better in the 70's