No, "we" knew how to do it with 10x more money and people on the board, in a very unsafely manner. It was a few times muscle flex and thats why it stopped.
Making entire thing routine, cheap and safe is something else, and "we" don't know yet how to do that, or we would have at least few scientists constantly on the Moon.
It's a difference between running a marathon and dropping dead, and doing it all the time.
> we have ...[other]... problems
This kind of thinking is nonsensical. With so many people around, there can be arbitrary group of people working on any kind of problem, without them needing to point to other groups as doing imaginary problems. You talk like unless everybody works on solving specific problem, its not going to get solved. Life simply doesn't work that way, mythical man month explained it well why for one, and then, you can't know what unexplored spaces bring (maybe game changing discoveries).