I've explained it before but presentation is so key to people. Some people want to transition and adhere to societal presentation of their gender. Others aren't worried about that and are comfortable with looking more traditionally "femme" or "masc". It's why you see terms like Trans Femme and others. Honestly it's not just a trans thing but an everybody thing which is why I think pronouns would be a great option. We all present ourselves differently! Some women are more masculine, some guys are more femme, and yet they still identify as Cis. It's just one big spectrum so who needs societal gender norms~
Edit to add examples cause I'm always afraid I'm not coming across correctly BUT, I have trans friends who present themselves as more masculine, who want beards and more chiseled looks. And then I have trans friends (like the one I mentioned) who don't want to look that way and want to have the softer features. They still use he/him pronouns but that traditional male appearance isn't something they aim for, just certain anatomy and pronoun usage. C: