Of course that's not their original purpose and they aren't very fit for their original purpose. (it's to include trans people, but trans women don't want you to ask what their pronouns are, they want to be addressed like women.)
Yes but how are you supposed to know if an obvious male in 'feminine' type attire wants to be referred to as she/her unless you ask? Could just be a man with a niche fashion sense. See e.g. Grayson Perry.