I think a lot of the debate about rules in field target is b/c so many try to push the limits to get an advantage. There are many who walk the line/push the envelope.
Much easier to just practice and kick butt, doing so a long ways from the edge of legal. Problem with being successful on the edge of legal is that many will just think it's cuz of whatever advantages that person has hedged up by being sketchy. Much more gratifying to just win, safely away from the questionable area.
In fact, much more gratifying to win while being as far away from the gray areas of legality as possible.
Good rule of thumb is to not do anything or use anything that you don't see multiple other people doing or using, especially people that have some time under their belt shooting ft.....a "when in Rome" kinda thing. If you're the only guy doing something, or even in the minority of people getting away with something the majority isnt doing, expect it to be questioned, as it should be, in my opinion.
An example is shooting Hunter from a bumbag. I've tried it and it's more stable, for me at least, lower center of gravity thing I believe. In this example it's also legal, to my understanding. But I'd be the only Hunter class guy sitting on a bumbag-just doesn't feel right. So rather than be questioned or people saying I only win cuz I'm on a bumbag, I sit on a stool, like everybody else does in Hunter at the matches I attend.