Are the players today better shooters? Absolutely.
Can they manipulate the pick and roll better? Absolutely.
Better on the fast break? Generally yes.
But there are many facets to the game.
Better individual defenders? Absolutely not.
Better team defense? Absolutely not.
Better midrange scoring? No.
Better post scoring? No.
Better iso players? No. Most players today have an average iso game because the pick and roll is so utilized.
Better rebounders? No.
Better handles? Generally, no.
Passing I would say is about equal.
So my point is, it's a nuanced debate when you dig into the details.
The large majority of the
no's you've put forward are wrong, but I just want to highlight the ones in bold because they're particularly glaringly wrong.
Defenses, both individuals and team defense are infinitely better than they were 30 years ago. Actually defending jumpshots are a recent phenomenon, and what I mean by that is - stopping the offensive player from getting to their spot, rising up, and getting a shot off. 30 years ago, defenders would either watch their opposite take a jumpshot with a cushion or make a haphazard attempt at throwing an arm in the air.
Here's an example -
This isn't the regular season, this is the Finals; this isn't a role player, this is the best player in the league.
Now just look at the lack of defense being played on MJ. Nobody bothered to close out on his 3s and nobody tried contesting his jumpshots in the post.
This is just a microcosm of all defensive play during that era.
Because ISO and post-play were the shot profile of that time, you essentially had to worry about your matchup and that was it. You didn't have to worry about running out to the 3-pt line to defend the open man, you didn't have to worry about hedging on PnR, you didn't have to worry about making a rotation when a defender got caught trying to defend a PnR; you didn't have to worry about every single position being capable of putting the ball on the floor, you didn't have to worry about a center creating offense behind the arc, you didn't have to worry about any given player being able to dribble with both hands.
There's infinitely more space to defend today, there's infinitely more versatility with how different positions create offense, there's infinitely more shooting to account for, there's infinitely more freedom in how players operate.
That's forced defenders, defenses and schemes to advance to account for that.