Not really "to pieces", but some mechanical connections can loosen up as time passes. This is one of the reasons why speaker amps in the late 80ies had pretty beefy chassis. That and also metal was pretty cheap back then. That said some manufacturers used gypsum like materials to make even stiffer "flooring" for their amps.

This vibration can really do a number on shoddy soldering joints, screw mounted electrical and thermal couplings (these also wear with thermal cycles). I mean people can laugh about overbuilt chassis, but in some cases it does make sense.

http://www.thevintageknob.org/sony-TA-F700ES.html

Makes sense to build a chassis to minimize vibration if it's also going to be sitting on a shelf next to the vinyl...