An interesting topic, but I think you’ve overlooked an important sex difference on the whole “each gender goes its own way” scenario. When it comes to relationships men are generally looking for an affectionate, physically attractive sex partner, so the idea of building non-sentient (or otherwise specially engineered) companions seems plausible.
But women are primarily looking for a source of material support, preferably of high social status. This pretty much requires a partner her society considers a legal person, capable of earning money and owning property, so very few women would be happy with “catboy” substitutes regardless of how well designed they are.
Obviously the end result of this unbalance isn’t going to look like the current status quo, but “each gender goes its own way” doesn’t seem like a plausible outcome either.
This is a great device for illustrating how devilishly hard it is to do anything constructive with such overwhelming power, yet not be seen as taking over the world. If you give each individual whatever they want you’ve just destroyed every variety of collectivism or traditionalism on the planet , and those who valued those philosophies will curse you. If you implement any single utopian vision everyone who wanted a different one will hate you, and if you limit yourself to any minimal level of intervention everyone who wants larger benefits than you provide will be unhappy.
Really, I doubt that there is any course you can follow that won’t draw the ire of a large minority of humanity, because too many of us are emotionally committed to inflicting various conflicting forms of coercion on each other.