I've talked about this before on other sites and I honestly think market research agrees, even if society doesn't.
Overall, there are precious few years where the average anyone, male or female is reliably potty-trained. To the point where not even little, tiny accidents happen. There is some research that indicates boys are more likely to continue to wet the bed for longer.
But girls, they *might* manage 24/7 control sooner than boys, but they lose 24/7 control much sooner. Science bears this out. And they're more likely to end up with minor accidents throughout their fully potty-trained phase. And the folks in the incontinence business recognize this. They pushed Depend to basically EVERYONE a few years back. Then they focused on moms. Research indicates that the main thing that keeps basically 90% of adult women out of diapers, before they get super old, is stigma against it. So they make all kinds of shit like pads and Impressa while slowly trying to breakdown that stigma. They've lately been pushing pads hard because girls already accept wearing them a few days a month and so it's an easier sell. It's "not a diaper" even though it serves the exact same purpose.
Did you know that Goodnites currently has pads for girls that are clearly rebranded Poise pads? They're geared for kids and teens who either have outgrown the full pullups style GN's or just feel like they have. Between Huggies, Pull-Ups, Goodnites, Poise, and Depend, Kimberly Clark seriously has an incontinence product on the market targeted towards literally. every. single. age group of female humans at this point.
They have most of the market covered for males, but just slightly less so. Because there's slightly less need.
Potty training, especially when it comes to girls, is at best extremely temporary, and at worst, kind of a myth.
Honestly, I kind of think the free market is on the cusp of getting almost everyone into diapers for one reason or another. Between the folks who want it and the folks who want a cheap buck out of anything they can manage, there's significant market pressure to convince people, especially girls, that potty training is a lie.