It's also political because it has specific implications regarding sex-based rights, free versus compelled speech, issues of medical consent - all of which were

It's also political because it has specific implications regarding sex-based rights, free versus compelled speech, issues of medical consent - all of which were existing and contentious political issues already. And also because opposing political groups are using it as a dividing line. Though interestingly, left-wing radical feminists have been consistently the most critical, which is at odds with most others who identify as left-wing politically.