You raise an interesting point. Are women's preferences in how they look organically theirs? Or is it conditioned over time by patriarchal beauty standards? Like, why do women actually like long lashes? If long lash products didn't exist, would women go out of their way to invent them?
Longer lashes look more youthful and healthy. So do bigger eyes and framing your eyes can make them look bigger, that's why people use dark eyeliner and mascara on light skin tones and light eye makeup on darker skin tones mostly.
This is of course not "organically" in their interest. It comes from our society valuing women almost exclusively for how youthful and pretty they look.
I dunno. If we're talking crazy-long-lashes, that's definitely the desire to be distinctive (something I highly respect). If we're just talking merely "classic lash extensions", then good question.
I'm sure some aspect of longer lashes is traditional and inscribed. It's not like any style trends are truly original these days. "Look at me, I'm edgy. I got a tattoo. Only had to get in line behind all the other edgy people who got tattoos".
I think stepping further, there's an aspect of systemic sexism that our first knee-jerk reaction to a woman's style decision is "men want, or wanted, them to look that way", but a men's style decision is more "to be yourself". I mean, if I'm being myself tossing on a pair of jeans with a polo, she can be herself getting an eyelash extension.