Why Torx Bolts?

Torx IMHO are the best fasteners. IMHO the heads strip less than hex and they look better than flat or Philips head. They do require a very inexpensive tool in which to make adjustments but I see this as a non issue as the most common are T6 and T8 which will work for the majority of knives with torx fasteners.
 
I agree that there is some additional resistance to stripping but that it's pretty marginal. I think they are mostly used because they seem fancy.
 
Torx screws are specifically designed to keep the bit from camming out when you apply torque, hence the name.
 
Don't know. Flatheads would be better IMO but I'm not the one making the knives. Torx head screws sure beat pinned knives and knives locktited down where it requires extra effort and know how to get inside. PurpleEDC is right, most are T6 or T8. Get some Wiha drivers and don't look back. A few may require T10 or or something smaller than a T6, so get a cheaper set if it worries you.

Torx screws do look better, albeit only marginally. I'd rather have more function than looks, but I guess I'm probably not the majority of knife buyers.
 
The nice thing about a traditional slotted screw is you can see when it starts to back out. Sometimes really high end custom guns, like fancy shotguns, have slotted screws that are tuned to reach the proper torque at a specific orientation. Like all the screws will be tight enough when they're perfectly horizontal. That way if the screw starts to move in the field you can see it and tighten it back the right amount.

Philips are actually designed specifically so the bit cams out when you get to a certain amount of torque. That's why they're good for like wood screws. The bit will start camming out before you strip the screw out in a soft material.
 
They have better screw systems that strip even less than Torx but the bits that turn them are not as common and widespread as torx bits.
 
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