Are there any actual disadvantages to them? They seem to perform as well as standard bike frames but with the advantage of being easier to mount and dismount without the top bar getting in your way. I know they were originally marketed to women who wore skirts because the top bar on traditional bikes got in the way and exposed their panties but it never quite made sense to me why these weren't just the "default" frame style in the first place, especially since most utility bikes and pretty much every single E-bike on the market uses this style of frame.