Those crappy shut-off valves with the plastic oval handle; the plastic gets brittle and shatters in your hand (especially if the valve is a bit stuck so you force it) and now you can’t turn the valve and your faucet has catastrophically failed so it’s urgent and the valve can still be operated with a flathead.
That said, all the ones I’ve seen use a Phillips screw to hold the handle on and there’s a flat section behind the handle you can put a wrench on to turn the valve, but maybe there’s some that need a flathead.
Those crappy shut-off valves with the plastic oval handle; the plastic gets brittle and shatters in your hand (especially if the valve is a bit stuck so you force it) and now you can’t turn the valve and your faucet has catastrophically failed so it’s urgent and the valve can still be operated with a flathead.
That said, all the ones I’ve seen use a Phillips screw to hold the handle on and there’s a flat section behind the handle you can put a wrench on to turn the valve, but maybe there’s some that need a flathead.
Those valves require some torque, the concept of having to use a flathead screwdriver to turn it gives me anxiety