They cake, there's no doubt.
But.
Due to the dryness inside(zero percent. Did you know a bag of concrete dry, in the store, is 6 percent?) and the formulation of the powder it's settling and tightening of blank space within the powder.
It has NO RESISTANCE to ANY force.
Let's make up some pressures :
85psi immediate release against a not compacted powder super fine, designed. Pllllaaahhheeez
Caking is not solidifying no matter how much your head tells you it is.
As above, if wrestling it every so often keeps the fear at bay, by all means. Wrestle it. All it will do is to introduce the propellent gas into it, you're not breaking up chunks.
Thought negates the testimony.
We are ruled by experts who say they're experts.
These times we live should be proof of that.