Welcome Anon, thanks for taking the time to post. I'm sure your sentiment is a correct one. Personally, I'm simply less interested in money itself (and therefore finance) than I am in the technology and social aspect of creating/having a robowaifu.
But you're obviously correct.
>but isolating which areas of the sector are most crucial at the moment should be the priority first
I'd suggest that rare earth motors that offer lighter weight and higher power is probably a very vital sector. The struts, frames, connectors, etc. hardware, can be made from lots of different low-cost & lightweight materials Anon. But the actual motors
behind the actuators? Not so much.
AI is obviously another critical area, but you hardly need to follow along with /robowaifu/ to get plenty of information on that. I'd suggest the autonomous driving
sector offers many corresponding requirements with our own here (>>112