Spoiler
Probably at the hardware store picking up more Phillips head screws.
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Don't feel bad, it's the PH design who's at fault. For some reason, someone decided PH should have tapered flanks, so that the bit has a constant tendency to slip out of the screw unless you push the bit into it with absurd amounts of force.
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.
No doubt, but in my own amateurish experience, the only way I can deal with PH is by using a power tool at very low speed while also applying pressure on the screw to prevent slippage (ideally one that also lets you set the torque).
I had honestly never even considered this possibility...
The cam out is a feature not a bug for when these were invented. They were made well before we had electric torque control cheaply and easily, so assembly lines developed Phillips to control torque using the driver and fastener. It's literally designed to cam out on its own at a given torque setting.
AFAIK, this is a myth. The original patents don't include the tapering, and someone else in the comments quoted the relevant parts from Wikipedia.
Cam out source
You're right it wasn't originally designed for it but later patents and iterations on the Phillips head driver specifically designed it in which is where I think the confusion comes from. I had always heard it was originally designed that way but I guess not.
The one on the right is actually "Pozidriv" (PZ), which is a little better than regular Phillips at least.
You're right, I should've mentioned that PH is the one on the left. The pic is from a Wikipedia article that compares PH with PZ.