Temper proof torx makes me lol, because almost every bit set I own includes them.
If you break it off you will most likely leave some behind, which will significantly reduce the mating area because you cannot insert the bit fully and may lead to stripping the screw.
Fair. It all depends on where it breaks off and how tight the screw is. In electronics the screws arent in very tight, and breaking it off often breaks it off all the way down to the base.
Whatever happens, tamper proof is a huge fail and a good joke
the only slightly justifiable use of slotted is something like the face plate on a light switch or power outlet, where it doesn't have to be particularly tight and it's nice you can remove it in a pinch with a fingernail or dime.
.. but really if someone came and replaced all of mine with torx I can't say id complain, so its not like they're good in that use case.. just less awful
A screwdriver - not a drill or impact driver. For those I always use the correct bit. But the $1 Phillips driver in my desk isn't gonna over-torque a posidrive.