Trying to ignore Dave's rubbish arguments (we are all still waiting for your report on what makes Adel so important to the team), so better to respond to a more sensible poster:
"These teams won all the medals right?"
New Zealand basically always plays above its talent level. It got a lot from its offensive system and clearly lacked talent and depth. Serbia lost to the gold and silver medalists, but otherwise were dominant and would've probably smashed Australia and France. If anything, they arguably struggled when they moved too much away from their usual system to run more through Jokic.
If you want to talk about medal winners, look at the offensive system of each of them. I'm wondering what the alternative offensive system that's being proposed. I hope you are not proposing going back to Brown's iso offense when he first took over. Or Nurse's NBA pick-n-roll offense.
The fact is that we simply don't have the talent on our team to *not* rely on an offensive system like Lemanis uses. Outside of Mills, our core struggle to create their own shot. They are not much as slashers. They're role player types. Only Ingles can run a decent pick-n-roll. Delly can feed a superstar like LeBron in that action, but we clearly don't have that. Although I don't know what happened to the Delly-Baynes pick-n-roll from years back. We have hard working NBA role players, yet the system makes the Australian team run some great offense. That should be enough to prove my point.
Look at the pre-WC odds. Even when Simmons put his hand up. Australia was well behind the likes of USA, Serbia, Spain, France, Greece. Serbia ran into two hot teams. USA's talent was not enough without a good system. Greece arguably tried too hard to let Giannis's talent take over. Canada's simple offense was exposed badly, eventually finishing 21st (behind New Zealand, by the way).
Let's not throw the baby out with the bath water.
"Except it clearly made our team work far too hard in the opening round, leading them to be tired by the end of the tournament."
This again wasn't the system's fault, it was a time management problem. To get to that next level, we need to solve the lethargy problem. Better time management. We did that better in Rio. Mills, Delly and Ingles shouldn't all be top 10 in minutes. More guard depth is vital, which was not available to us in this tournament. Hopefully Simmons and Exum help in that regard. This will help at the offensive end of the floor, but probably even more at the defensive end.