[JoeAltmaier]

Reliability. Screws come loose, especially when flexed in a pocket etc. Its considered a win in mechanical engineering circles when you remove a screw from a design.

I look forward to metal-air batteries, where the charge can be expected to exceed the lifetime of the device.

[HashHishBang]

Not to run too far away from the actual content of the post but...

I thought metal-air batteries didn't produce a high enough current to be used in devices requiring much more juice than a hearing aid?

[JoeAltmaier]

Alcoa runs a car on an aluminum=>alumina metal-air battery!

[cmdrfred]

Even when the part is normally a replaceable part? Perhaps this explains the increase in difficulty in repairing cars nowadays.