Not tamper-resistant - tamper evident.
And that's a good point - hinge screws should be tamper evident because a loose or wobbly hinge puts strong forces where they shouldn't go and it's possible to damage a chassis and internal boards if they are not torqued correctly Screen hinges are subject to a lot of forces through use and abuse, and while they are strong, the get that strength when properly attached. Do it wrong and you'll put stresses where they weren't designed to be, which can be a cracked or bent case at the best, bent or cracked circuit boards or screen at the worst. So Apple puts it there to see if you've been fiddling with the hinge and possibly caused damage not covered by the warranty.
Exactly. A short cable that has to be attached like the iPhone 5S means a time-robbing assembly step that's done in tight situations.
Making the cable long may cost 10 cents more in materials costs, but if it saves the worker 20 seconds of time, it increases manufacturing throughput of that worker and thus makes up for the extra cost.
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