is the phrase "ladies first" bioessentialism?
this is bioessentialism, sexism, misogyny and to some extent pseudoscience
before answering this ask, i actually read up on the history of the phrase. well, at least, in english. still, it's just something i looked up on several sources only just now so i can't promise that everything is 100% accurate. the conclusion would be the same even with some corrections though.
i've seen different hypotheses of the etymology of the phrase and i wil share some. but if (general) you is interested, i recommend googling it for more details, there are many articles.
(i am using binary language here as it is a part of the concept and women and men is about how society views the situation.)
universally agreed etymology of the modern usage came from shipwrecks in 19th and 20th century from the phrase "women and children first". while there is no actual maritime law related to women and shipwrecks, this phrase and idea was used several times back then. the first documented usage of this specific phrase was in the mid 19th century. instead the actual rules are about people in disadvantage like disabled people, elderly, etc. at least, that's what i found. this whole thing implies inherent weakness of women. and the ironic thing is that a study/studies found that women have severe disadvantage in survival rates in shipwrecks vs men.
the hypothetical etymology about the oldest usage of the concept i've seen is that it started in prehistoric times, where women were sent first into danger as men were deemed more "important for survival". obviously, we don't know all the cultures from that times, but there were at least some where it is believed to be common. it is also believed that the same tradition with same reasoning was present in the viking era and in some places in the middle ages.
so yeah, it is absolutely rooted in bioessentialism and the current usage totally misconstrues the actual history of the saying, trying to paint it in some kind of a positive light(which still would be benevolent sexism without the whole history).