Stop.
You saw no high bball iq play from the late seventies to the the mid nineties.
Wow, you're going even further than I would. I mean, you're certainly right that there was far less high bball iq play in that era, but I wouldn't call it "none."
That was the era when the entire industry still hadn't figured out that shooting 3 points at 35% is worth more than 2 points at 45%.
The era when most teams didn't even play defense until the 4th quarter of regular season games.
The era when many players didn't even know how to switch on screens yet and plenty of teams didn't even practice it.
The era when running a pick-and-roll 30 times a game could get you into the Hall of Fame as a coach.
Hell, the era where teams who knew the pick-and-roll was coming still defended it like THIS:
The era when the top bball IQ player in the NBA played like THIS. (Ignore the errors, instead look at how insanely basic the plays are that led to the errors. Most of the time in the half-court offense, everyone is just standing around. Watch players just run across the court without even a set place to go, often running into each other in the process. Watch defenders look downright lost in clutch situations even though offensive players are being basic as hell.)
High IQ era.
Hell, I just noticed, look in both those clips at how OPEN the jump-shooters were. You have a guard or a jump-shooting forward get the ball 15 feet from the hoop, and his defender decides to...just wait? No wonder they could make mid-range shots at a 40-45% clip back then.