Actually most of the "Philips" screws you see in the USA haven't been Philips for years. The last stronghold for Philips was in the electronics trades and other applications calling for nice cosmetics.

Otherwise, most of those screws today are a variant of "Pozidriv". The key difference is that Philips drivers come to a point, and the more modern variations don't. Forming screws with the full depth to accommodate the pointy drivers is more difficult, so they don't bother.

There's an easy fix if you have a bunch of Philips screwdrivers that aren't working for you. Just grind the point back so the driver can settle deeper until it's supported on the blades. This isn't a technically correct conversion to Pozidrive or JIS, but it'll do the job.