We think that the focus on 'afab' is very confusing and likely disrespectful to other people's gender.
We'd say it's not really possible to be attracted to a gender assignment and probably what you mean is genitals or some other physical features.
Most nonbinary people who have worked hard to get rid of or distance themselves from their gender assignment are probably not going to appreciate you finding them attractive based on a gender assignment.
Genital or other physical features attraction is probably okay and much better than saying you are attracted to a gender assignment. If you are going to call yourself 'sapphic' then unless you are legitimately only attracted to women and lesbians, regardless of genitals or other physical features, then we suggest just explaining your attraction rather than using 'sapphic' by defining it as being attracted to people who aren't women/lesbians but who have vaginas and not being attracted to women/lebians who have penises as that's just invalidating and transphobic, nonbinary erasure etc.
Yes. Most of the 'west' is though. To be honest some of the 'east' is too. Most governments have done this or equally bad things. This isn't to excuse the 'US' more highlighting that there is a problem with building a group of people into an organisation that gets to make all the decisions about both a certain group or certain groups of people supposedly under their care, and who make decisions about how they should 'deal' with other groups of people.
[Sarcasm] It's almost like making arbitrary lines on pieces of paper and then isolating yourself somewhat or completely from people outside of those lines and being selfish instead of sharing is a bad idea.