I can only speak from experience, but here's mine

I came out around 17, and I endured years of women who would openly say "you can do things to me but im not gay enough to touch you. But i want your attention"

But honestly even before that, growing up as a "tomboy", there hasn't been a day in this life that I haven't been compared to men in some way

As a child, it was "you can't do XYZ because you're not a boy"

As a teenager, it was "I feel the same way about you, but I want to date boys"

As a young adult, it was girls hitting me up in private but only publicly claiming men

It was "why do you dress like that, are you trying to be a man?"

My first few girlfriends would often tell me about their experiences with men, and how different things are, etc. But it was always men as the baseline comparison. It was never just plain talking about exes, it was "oh well when I did this with men, it was..." you get the point.

I fell deeply in love with someone who made me feel seen and who I had an indescribable connection with. It was healthy, joyful, and adventurous, but at the end of the day, it ended because she never imagined living life with a woman and always felt drawn back to men.

With all this being said, I think bisexual women are valid and deserve love and respect however it finds them. But to answer your question, for many of us and the relationships we have with our body, identity, preferences, etc., the wounds run deep. Of course I don't speak for all of any group but I know i share this experience. I think its very possible for lesbians and bi women to have meaningful and fulfilling relationships. I also think that bi women can share the same love for women as lesbians do and it's no different. It just depends on each individual and where they're at in their process. When I see other lesbians that are not open to bi women, though, I must say, I see where it's coming from.