Has anyone ever encountered a circumstance where a disc was challenged at a tournament due to it possibly having post-production modifications? I certainly haven't.
Yes, but it was a rare, unique situation. If I see it once again in my lifetime, it would be equally as unusual. As scarp alludes to, I would venture to say that the chances of someone playing a legitimately reasonably full disc golf tournament life and not ever seeing it occur are very high -- even given that those "possibly illegal discs" are challenged.
We don't enforce this rule for the same reason we don't actively hunt for overweight discs, because there are a whole lot of other things our minds need to be on when playing, and a whole lot of other things the a TD needs to be doing while running the event. If we enforced such rules to the letter of the law, we'd have no time left to have an event.
To some degree ... but also primarily because this is something you notice, not something you would look for. When I guy drops his putter on a bench and I hear a wood block-like "clunk", then I ask him to see the disc. And I find a disc which anyone can tell it;s well over 200g; 280is what the TD later told me.
We are well on our way to an agreement that the rules concerning disc modifications do not work. I also agree that translating our ideas of fairness into rules is an imperfect effort. However, the latest comments do show promise that we can do a better job of articulating our views concerning the treatment of discs.
I am proof that there is not universal disregard for the rules. These pages are proof that not all people read the rules well and apply them reasonably. When we see a defect in the rules we can do nothing and let the organization fall into a pattern of quarrels or disrespect for the rules. Then we instruct others that rules are to be dismissed in favor our "better" judgment. Or, we can employ that same judgment in the making of a new rule upon which we can all truly rely.
Peer pressure may have operated deeply and widely here so that TDs may have no fear of trouble and therefore see no need to address this issue. I don't see that lasting long.
Not a chance. Your premise is faulty, in that you term "seasoning" your disc in the back yard by "throwing it against something repeatedly" or other methods of exposing the disc to contact via a disc golf release is "skirting" the letter of the rule. I can reasonably contend that it is not. If I have a basket in my back yard and putt 1000 times a day from 5 feet or 10 feet away for three weeks before I decide that's my driving putter, is that seasoning the disc illegally or is it play? I say that's wear and tear from play, and I don't see how you can argue differently.
Now that that's agreed upon, where is the line? What if I putt the same amount of times with a mid range or a driver? I know plenty of people to normally putt with their mid or driver. Is that the line? Is that illegal seasoning or play ?-- and how is it different from the above? I say it's the same. And by extension, what if I can't afford a practice basket, so I have my own homemade one with string twine and whatever leftover wood I could find? Illegal seasoning or play? What if I don't have either and I practice putting against a tree at the neighborhood park? What about the same with a mid or driver? ...And by extension what if I need to practice my technical woods shots and I live near no woods, and the only place to practice accuracy is by hitting a natural target at the local neighborhood park? And what if I do that a lot? I think all of those are play. Whether I throw (a disc golf throw -- BH, FH, OH, CW, or putt) my disc in the backyard into a net, into the fence, or into another object, I am still practicing my throw and my release. That's practicing disc golf, and it's unequivocally
play.
The thing your premise is standing on is that the backyard throwing the disc into objects is not "play" -- but I contend it is.