Then what would she be if she's not gay/bi/pan?
As for why, I mean it feels fairly obvious. It's a story where both women have spent time in romance with boys, gone completely terribly, and yet they find love and companionship in their own relationship. A slow burn one with all the signatures of classic romance. Enid talks about Wednesday as if she's her world, calls her her pack, risk being lost as a alpha to save her, while Wednesday spent an entire season with the sole focus of trying to save Enid and made a pretty romantic promise of saying she'll never let Enid be alone. That's before we get into all the love language in little individual moments.
I don't think the writers want it. I 100% think Jenna and Emma are playing into it and it's definitely what the majority of the audience wants. Which is funny considering the talks of a boycott of s2 by a certain shippers.