1. They’re not a great design
2. Screws are made as cheaply as possible
3. People assume their drivers last forever. Just a tiny bit of tip damage and they’re grind up any screws.
4. Philips in impact drivers is a sin.

edit: 5. There are different Philips sizes; any Philips will fit in any equal or larger plus-sized hole, but barely engage and both strip the screw and the driver.