the problem lies with the application of the technique, not the technique itself. A correctly soldered electrical joint will always have electrically superior connection, but may lack mechanical strength. A correctly crimped joint will have nearly as good electrical connection, but a slightly improved mechanical strength.
As you rightly said slob, the majority of peeps will use the ****y flexi crimp tool that comes with the packet of crimps.
The only correct way to make a crimp is by using a ratchet action crimp tool, which ensures the same high forces are applied consistently every time.
I invariably use through crimps rather than male/female spade connectors as they just cant work loose. Then wrap the whole joint in one turn of self almalgamating tape.