Lesbians can certainly bear children by themselves, just as any woman could. By that point, it does not matter (for the biological notion of conception) if that woman is lesbian, heterosexual, asexual, or anything else.

As opposed to that, the mindset of getting a partner for the sole purpose of having a family, while certainly more often found with those with non-womb reproductive organs, can probably be found with both males and females and in either case is sure to be appalling to the partner (or to other people at large).

While I strongly agree with your basic point, I'm not sure I like the way you make that point.

In my understanding, both the OP and yourself implicitly talk about the whole parenting affair and not just getting pregnant with a child, at which point the social faculty of being a good parent becomes more relevant compared to biological disposition.