I think the main reason that Apple(and a lot of other manufacturers) use these is because they simplify automated assembly. Since they're using torque wrenches to screw it in, it's better to have a screw head that won't allow the bit to fall out. Since the Torx screws can be flush with the surface they're preferable to using a hex bolt.

On another note, this is perhaps the first time ever that a DYI advocate is complaining about needing to buy a new tool. At this point, if you're a remotely serious electronics hobbyist, you should have one anyway.

EDIT: Grammar fail.

I do not love computers and I certainly hate the MBA (for its glossy screen). Bringing up those screws strikes me as pedantic and disingenuous, though.

Apple's not the only company that uses "non-standard" screwheads to discourage opening hardware. Fewer people opening cases -> fewer warranty repairs for user error. That allows Apple to continue to be liberal with good warranty service. I'm not the only one with the experience of walking into an Apple store and getting a replacement iMac for a failing one with few questions and little hassle.

As for applecare, they seem to be pretty lenient with those policies as well. My iMac was replaced in under a year but I've also replaced an iPod after the standard 1 year by paying just for the price of applecare (after the year had already passed). In any case, I feel pretty good about not having to worry about my Apple products. I'm ok with paying for an $8 driver once in a while if I really need it to swap parts.

Those are standard screwdrivers.

This is how I imagine the story playing out: Someone at Apple thought it would be a good idea to have fewer of those cases where someone cracked open his laptop for fun and ruined it and then was bitterly disappointed when Apple wouldn't fix it on warranty. That's a lot less likely to happen when nobody has the correct screwdriver just in the basement and has to order it from somewhere.

Whether that's the right or a useful thing to do I don't know but it's also no big deal.

The "standard" you're referring to is simply not as good. Older screw heads are dated designs that are more likely to strip out than a torx or hex design. They're mostly still in use because the benefits of being common outweigh the downsides for many applications, especially in materials like wood that are more forgiving.

Torx is an accepted standard (just not one commonly found in homes.)

Lots of manufacturers use torx screws in locations where there is very little chance a home user will ever see them. They do it because it makes for a better product initially and easier repair by a professional later on.