Stats > Your Opinion
You can't have it both ways, sorry, on one hand you cannot say it's harder to play defense today then turn around and say the Pacers aren't one of the best defensive squads ever even though they are holding teams under 42%. People ALWAYS throw stats out when they don't back up their claims
Freethrow is a constant, if skill were diminishing as much as you say then the average should be lower, because it is one of the most basic skills we can compare across eras since the distance hasn't changed. The mid-range game didn't die, it migrated to frontcourt players because of spacing, they are often the only players that can get off clean looks. You don't seem to get that the zone is why players take so many 3s, just because a team isn't running a 2-3 out there doesn't mean the principles aren't at work. So numbers aren't proof, but pointing to 1 single player and saying "look look" is?
And this is where your point falls completely apart, for every Scottie, I can name several wing defenders that are better and considerably taller/longer than John Starks, a guy that played on the best defensive team 20 years ago. So, basically your whole point centers around taking the absolute best player and then comparing him to someone else who isn't in the same ballpark, or a starter for that matter. Instead of Birdman, how about swapping the teams, take the Pacers core minus Hibbert and give them Hakeem + 90s rules, how much better would they be defensively? Or give Hakeem the Heat core, how much better would they be defensively

You basically shot yourself in the foot with that.
You're talking pure opinion and nothing else, you have nothing to backup anything you're saying other than how you feel. Please show me your data on the ability to throw entry passes and how it's diminished in the last 20 years

Of course you can't, but you'll point to one example and paint with a broad brush that all can't. The game has become perimeter oriented because of the zone rules, why is this such a hard concept to understand? Al Jefferson's team is 3 games under .500 and what a coincidence, they are one of the worst 3 point shooting teams in the league. Your argument that players are less skilled centers around Dwight, lets turn a blind eye to guys like Steph Curry that get by on nothing but skill and the ability to shoot from anywhere on the floor, lets just focus on Dwight

I've backed up my points with stats, so far all you've done is used your opinion and try to pass it as fact