I think the perception was they were all 3 in their prime. I thought they were. But can your prime ever be considered the year before your game falls off a cliff? Because Wade fell off a cliff health wise by the next season. Still a very good player, but no where near the Wade of 3'or 4 years earlier. That's why the Heat experiment was a success, but not at all what anyone expected. In retrospect, Wade's prime occurred before Lebron ever got there.
I recall the Miami radio hosts joking about pulling a fan out of the crowd to play pg and still winning 70 games. I thought the could too. That was the perception, but the reality was Wade had like one prime year left, and they wasted it because him and Lebron couldn't figure out how to play with each other. They were still good enough to win 2 rings, but no one could describe Wade as in his prime any of the last 3 seasons. That Wade would be a shell of himself so young was a bit of a shocker. Many knew his game wouldn't age well, but no one foresaw him having to be on maintenance programs at 31 and 32 years old.
This team has a chance of being what most thought that trio would be.
Kyrie and Kevin are pre-prime if anything, and Lebron should age much better than Wade.