This argument is in no small part covered in
https://worrydream.com/refs/Lockhart_2002_-_A_Mathematician’s_Lament.pdf
which is also available in 5-times-the-page-count-and-costs-$10.
Then you should pay them 10 years of generous salary to produce a curriculum and write model textbooks. You need both of that. (If you let someone else write the textbook, the priors say that the textbook will probably suck, and then everyone will blame the curriculum authors. And you, for organizing this whole mess.) They should probably also write model tests.
The problem undergirding the problem you’re talking about is not just that nobody’s decided to “put the smart people who know math and can teach effectively in a room and let them write the curriculum.” As a matter of fact, both New Math and the Common Core involved people with at least all but point 2, and the premise that elementary school teachers are best qualified to undertake this project is a flawed one (if it’s a necessity, then Lockhart may be the most famous exemplar adjacent to your goals, and reading his essay or book should take priority over trying to theorize or recruit other similar specialists.
I think that this post relies too heavily on a false binary. Specifically, the description of all arguments as “good faith” or “bad faith” completely ignores the (to my intuition, far likelier) possibility that most arguments begin primarily (my guess is 90% or so, but maybe I just tend not to hold arguments with people below 70%) good faith, then people adjust according to their perception of their interlocutor(s), audience (if applicable), and the importance of the issue being argued. Common signals of arguments in particularly bad faith advanced by otherwise intelligent people include persistent reliance on most listed logical fallacies (dismissing that criticism and keeping a given point after its fallacious nature is clearly explained; sealioning and whataboutism are prototypical exemplars), moving the goalposts, and ignoring all contradictory evidence.
Another false binary: this also ignores the possibility of both sides in an argument being correct (or founded on correct factual data). For example, today I spent perhaps 10 minutes arguing over whether a cheese was labeled as Gouda or not, because I’d read the manufacturer’s label which did not contain that word but did say “Goat cheese of Holland” and my interlocutor read the price label from Costco which called it “goat Gouda.” I’m marginally more correct because I recognized the contradiction in terms (in the EU gouda can only be made from milk produced by Dutch cows), but neither of us was lying or arguing in bad faith, and yet I briefly struggled to believe that we were inhabiting the same reality and remembering it correctly. They were a very entertaining 10 minutes, but I wouldn’t want to have that kind of groundless argument more than once or twice a week, and that limit assumes a discussion of trivial topics as opposed to an ostensibly sincere debate on something which I hold dear.