I could totally understand this decision for post-2020, but I agree with koberulz on this: there must be something else going on, perhaps a player(s)-influenced decision, or more likely, non-players. We need extra personnel to lift to medal level, and in my mind that leaves only one player. Both Bolden and Simmons have obvious and rumoured grudges against Lemanis respectively. Bolden's departure was dramatic, while Simmons appeared to have an issue with Lemanis dating back to being left out of the 2016 team. But it's Simmons who we really need for 2020.
Brett Brown is a solid replacement. His NBA record is irrelevant. His Boomers record is more relevant. Does anyone remember the Boomers offense when Brown first took over? The main offense consisted of iso ball with Jawai. Brown improved over his tenure, but even Lemanis critics have to agree that Brown extracted no more out of his talent than Lemanis did.
Australia is now ranked top 3. I don't think anyone here with a pulse on world basketball would've expected the Boomers to rank top 3 near the end of Lemanis's contract.
Unless Brown quits (or is fired from) the 76ers, how does this affect qualifying windows? We need an assistant to take the helm of those teams.
As much as Lemanis has been criticized, I believe unfairly, for prioritising the system over talent, this same emphasis on the system not only allowed players like Kay to seamlessly slip into the A-team, but it also allowed smoother transitions in the qualification windows, where the team saw 33 players, YES THIRTY-THREE, different players suit up. Of course the Boomers should cruise through these games, but we still should be aiming to win every game in Asia by 20+ to gain full ranking points. Ranking matters because it puts us in a more advantageous pot.
This matters in the ease of first round opponents. Spain, for example, was in the top-3 (+host) pot, which means they couldn't be placed in a pool with any other top 8 nation. This allowed Spain to rest their stars more in the first round, a luxury that Lemanis didn't have. We are top 3 now, so only now can we take full advantage of the results that Lemanis has achieved.
I hope BA also understands that the teams that performed well in the 2019 World Cup all had a coach that had already had years to develop their system and chemistry. The biggest failures/under-achievers: all teams with new coaches.
At least Brown already has some previous experience coaching Delly, Mills, Ingles, Baynes, Simmons and Bolden. But damn, this this is a risk that BA is taking with so little preparation time before Tokyo. For this to work, surely the Boomers still need to run much of what Lemanis did that made them successful, with Brown adapting and adding more for the inclusion of Simmons.