it's all about context. The players chosen from the 50's, 60's and 70's were great in their era at their pace, regardless if it was different from today. Is Chris Paul on of the 5 best PG's of his era? No his era is 3 years old. Steve Nash, Jason Kidd, Chauncey Billups, Allen Iverson are the top PG's of this decade.
Gary Payton is on of the 3 best PG's from the 90's and has accomplished much more than Paul.
Is Wilt the best or 2nd best player ever? Yes, depending on preference. According to you the best player ever would have the best PER.. that shows how efficient a player was, but it doesn't show other characteristics, like the ability to lead and motivate a team (ask Paul Pierce how important is was to have someone like KG on the team being an emotional leader) or to make clutch plays in a tight game, or to be able to get a basket when the other team is on a run. You have to watch the games to see how a player gets his stats.
You always disregard the intangibles but this is not a bunch of robots playing the game, there are guys like KG who you don't want having the ball with the game on the line, yet his stats are much more impressive than say Reggie Miller, but Reggie has ice in his veins and wanted to be the guy taking the shot with the game on the line and more often than not he delivered. 
And this TS stat.. reggie's TS is .614, but his career FG% is 47% and his 3pt is 39.5% good not great numbers. But because his freaking FT% is 88.8% it inflates his TS percentage to make it a very high number which is misleading. Thus the limited value of such a stat.
I don't see it being a huge issue having to defend the choice of older players vs a modern stat that is skewed with a bias to favor the modern player.