My two cents, which is probably worth just about that.
When booties first raged into the stores, seems to me that FPE *was* the goal, or at least, the initial retail translation. Or how the merchandise translated in photos on twiggy legged models. But now it seems to be moving away from FPE to more fitted in the ankles. (Along with more pointy toed styles, which sets this style retread apart from the 90s). Not sure if that is where the trends are going, or if the trends are being driven by flattery and practicality restraints and what sells best.
Personally, I think booties came back into style simply because tall boots were getting more and more difficult -- too many fit points, shaft height, shaft width, AND ankle height and width too. So it made sense retailers shifted to booties, no more "extended calf" and "narrow calf" to deal with. But yeah, booties still have fit points -- not just the darn ankle shaft width, but height too, which is, frankly, just as much a bother to me as finding narrow width booties. Grrr.
One year on the market and retailers probably realized that the booties they were selling didn't work all that well with the pants they were hawking -- to unfrumped's point -- so next we had a flood of sausage casing too-tight jeggings and awkward ankle length pants, and yes, booties that hug the ankle.
