Grape, the hubris of youth. The league was hardly undeveloped. There were fewer teams hence a much smaller percentage of the hangers on that beclowned the Stern era NBA. While athleticism has improved the corresponding diminution of skills (dribbling, picking, passing) has regressed substantially. Few guys even understand the tremendous efficacy of a very simple proposition: get the ball to the biggest strongest guy on the court as close to the basket as possible and something good will usually happen.
You think a weaker league explains not just his 3000 point seasons, but a 4000 point season? Eight or nine years in (and Wilt was 23 when he started, not 18) he had a 24 point 24 rebound season, and, as a center, led the league in assists. Who do you see doing that today? I'd say no one because no one's come close in the 48 seasons since. Wilt's rookie year he averaged and scored 25% more than anyone had previously done. Averaged more minutes one season than there are minutes in the regular season by playing more OT than sitting regulation another year.
As to the stats, which are themselves still unparalleled for individual performance in the most number of categories, Wilt started five years out of HS and played his first 6 or 7 seasons in 72 and 80 games season. I'm not old enough to remember, (not yet born) but Wilt was NBA ready out of HS from the news accounts and his obvious dominance in college and the early pro years.
And......in the ultimate statistical concession to team work, not just Wilt but the other Lakers said, at the time, that Wilt literally was only expected to come down on offense about half the time because Elgin Baylor, Jerry West, Gail Goodridge, Harry Hairston and Jimmy McMillian didn't have any trouble scoring without him. As hard as it is to believe that was their actual and well known game plan. The other geezers need to remember those Laker teams, snake bitten in the finals all too often, but they were just a shooting machine, and one of the shooters wasn't a guy with a 30 point career scoring average.
On the other end, Walton, Kareem, Cowens, and even the great Nate Thurmond have all said that no one closed the post like Wilt. Watch video of especially a young Wilt. He played defense like a touch free guard but was a 7'1" high jumper so he could block shots from ridiculous distances while being so strong no one could back him down. Last season he led the NBA in rebounding for like the 10th time. Averaged around 18.6ish, second lowest of his career. Only one player since then had a better average, and that was in one season. That's in 42 seasons since with some pretty good rebounders passing through the NBA.
And then there's the chicks.
Wilt Chamberlain is a god.