No, they're trying to make sure they get their pound of flesh any time one of 'their' devices needs to be repaired. If the NSA (et al) are really serious about having hooks into Apple products they'll make sure to get them [1], glued screens and batteries and firmware kill-switches notwithstanding.
If it were about privacy and security Apple could have the device display a warning when it detected tampering and leave it to the user how to act on this, a bit like some Android devices react when the bootloader is unlocked. They could also sell OEM spare parts which could be used by third-party repair shops to repair devices and use a verification routine to re-certify the device (which then would not display a 'tampered' warning, instead showing a 'repair log' in some hidden settings screen).
C'mon, at least finish the damn sentence. They were slowing down older devices to make sure that they wouldn't just literally shut down when the aging battery could no longer supply enough power for spikes of usage.
If it were about privacy and security Apple could have the device display a warning when it detected tampering and leave it to the user how to act on this, a bit like some Android devices react when the bootloader is unlocked. They could also sell OEM spare parts which could be used by third-party repair shops to repair devices and use a verification routine to re-certify the device (which then would not display a 'tampered' warning, instead showing a 'repair log' in some hidden settings screen).
[1] https://en.wikipedia.org/wiki/PRISM_(surveillance_program)