While a lot of players would benefit from modern sports a lot of great players would find out that they had a ceiling that they didn't know they had, which is what happens to most athletes. They are all motivated like crazy but some workhorses become Julian Edelman's and the rarity becomes Jerry Rice.
The overall era stuff is tough because it cuts in favor of the era you prefer. If you consider today to be softball then yeah a guy like Curry's skill sets will translate horribly in the 60's and 70's. But that's the direction the sport is going in.
Also lets be straight up here, if you are 60 or younger you are too young to have seen Russell or Wilt and put them in any proper context. A 60 year old today would have been 11 in Russell's last playing year. And no offense, I don't really care for someone who was 6 or 7 during Russell's prime telling me about him. So if you are 65 plus, fine give an opinion on him, but anybody else is just going off what they heard, the stats, and the clips they watched like everybody else. So this whole "you didn't watch a basketball game prior to 2010" is such a false shield. I religiously watched Jordan as a kid and even I feel uncomfortable acting like I watched that and was anything but a kid who was amazed by what he saw. But I do know how his stats stack up, I do know how Bird called him god disguised as a basketball player and how even during his playing career guys like Magic and Wilt and Russell were singing his praises. At some point you go far back enough and you are going to hit someone you don't have context for. In football context Otto Graham went to 10 straight championships and won 7 of them and he did it across both relevant leagues. You'd have to be 80 or likely older to have watched Graham in his prime and to have an accurate "I saw it" argument to contextualize his place in history. In yet there are plenty people in the NBA not to long ago who freaked out and made a bunch of excuses when I made the comparison to how Jordan is to Russell what Brady is to Graham. And that's ignoring that much younger people were calling people like Kareem in basketball and Montana the GOAT. So again it's fine line comparing across era's because everyone wants to act like they are knowledgeable and to a certain point everyone isn't and they have to rely on things other than the eye test.