That's because you may as well be genociding them. Women would serve literally zero purpose in the event that both artificial conception and wombs are invented. They'll whine about it all day long but they know deep down that sex and breeding is their only purpose on both a biological and societal level. Well, actually I do suppose 'motherhood' is also one of their purposes... but that's irrelevant since they don't provide that any longer and the task has been largely picked up in necessity by fathers—which isn't a perfect, but is just our reality.
If you took it even FURTHER and proposed a hypothetical where waifubots exist, femroaches would be entirely screwed. Obviously nobody is going to go around killing them all off, but they would become obsolete and would just die off naturally. There is no real reason for any guy to willingly have daughters—at least, not from a practical standpoint. Having daughters would be seen as this odd, 'archaic' thing that some people would do just for the sake of entertainment, or perhaps being different.
Femshits would likely never die off entirely, but they'd be reduced to like 0.5% of the population, if not less.