Content warning: Bi/Pan lesbian discourse
This is my general thought process on the matter, correct me if I missed anything, if I'm wrong, or if I'm overstepping my boundaries. Keep in mind I've always identified as a binary trans women, but I've been questioning if im nb.

1: Bisexuality, generally, is an attraction to 2 or more genders.
2: Nonbinary gender identities, being nonbinary, are not the same as binary ones.
3: This means nonbinary women are not the same kind of woman that a binary woman is. They are not "just women".

4: If that's the case, that means attraction to both nonbinary women and binary women can be a form of bisexuality, making the microlabel of bi lesbian appropriate. It reflects the reality of that person's specific identity.

Some clarification: No identity made in good faith needs justification for its existence. Unless you can in good reason assume a label is actively harmful. (bi/pan lesbian exclusionists have not in my opinion raised any good reasons, which is why this thread exists)

Additionally; this is only one situation that some one may self id with bi lesbian or pan lesbian. Just because a bi or pan lesbian doesn't have the same experience as this doesn't make them invalid.

And because I ran out if space to add this, I don't mean to say nonbinary people can't ever tie their identities with binary genders, after all it is ultimately their lived experience that decides the validity of any id that expresses who they are.

and I don't mean to say that nonbinary gender identities are just parallels to binary ones, i used binary women as a specific example but this only includes the people who self id as such, naturally. nonbinay identities aren't as simple as that. (which is why microlabels are good

oh and as a side note to my first post here because I also ran out of space, ive been questioning if im nonbinary for a long time. its been something ive asked myself over the past year or so.