QED, a few things are patently obvious.
1) You are an engineer type - probably a mechanical engineer - or at least one in the making
2) You are a bright fellow
3) You are attempting to dazzle or browbeat others into changing their minds using the two previously listed characteristics of your personality.
4) You are right -
IN THEORY. You've got all the theory down pat.
5) In the real world, and based on practical EXPERIENCE, the length of time required for mechanical creep to seriously degrade the performance of a quality magazine spring is measured in decades - or even longer. Long enough to make the whole argument pointless.
6) Wolf just might be exaggerating the facts a little - they do have a vested interest in doing so since selling springs - including magazine springs - is the business they are in.
You're a new guy around here, so just a bit of friendly advice (and I DO mean this in a friendly way). Dogmatically hammering on the same point for the sake of being right isn't the way to win friends and influence people. That may be the way to win lots of admirers on a lot of forums, but not here. So you might want to lighten up a little. This is a nice place with lots of nice people, many of whom can give you the benefit of MANY years of real experience. Don't discount the value of that experience, even if it doesn't 100% line up with the theories that you've obviously learned (very well) in books.
People around here are known to do things like GIVE perfect strangers on the board parts that they could just as easily sell, just to help out a fellow enthusiast. That's the kind of place this is, BUT people don't tend to offer that kind of help to those who care more about being right and showing off their smarts, than they do about making friends, and respecting others.
BTW, not that it matters, but I am also an engineer - kinda one of those "takes one to know one" deals....