I often hear martial artists talk about compression as one of the ways of gathering power, particularly in the joints.  The idea is that one can compress energy and then release it against an opponent.  This technique works.  But it has some big flaws that can be exploited, it is fragile.  When an opponent compresses themselves they create a moment of rigidity.  Whenever an opponent is rigid they are vulnerable to either being broken by a big mass crashing into them, or having their connection to the ground broken by a tiny bit of upward movement.  Even more embarrassing, if I can add some weight to an opponent’s self-compression they may tiddlywink themselves backwards or simply collapse.  

So one of the reasons all internal marital artists practice shrinking and expanding is to ensure that we can shrink without the slightest bit of compression.  This by itself has intrinsic healing ability.

In my experience, compression is painful if practiced a lot, and tends to wear out the joints.  It is probably harmful to the internal organs and I suspect it creates a lot of negative emotion.  

Yes, compression can be used for generating power but its downside is nearly unlimited while its upside is small and over rated.  (Kind of like fruit cake:)