I think the bigger question is:
Is it intrinsically better and more feminist for women to only have emotional/romantic/sexual relationships with women?
I know that there is a school of thought within radical feminism that, yes it is.
But I know that plenty of women would disagree, not least because most women are heterosexual or are in heterosexual relationships and would feel affronted by the idea that it is only "false consciousness" or social conditioning that stops them being in a relationship with a women.
So ultimately, I think political lesbianism is an interesting discussion, but one that has the potential to be very alienating and thus, I'm not sure how helpful it is to the feminist movement as a whole.
I often see the differences between radical feminism and more liberal kinds as the difference between a radical and reformist ideology, the former may be aiming for bigger changes, but those changes are often less achievable.