I've been watching the stand and deliver argument for over 15 years now, and honestly, I don't think it's relevant. When you watch the top guys, like McBeth, Doss, Sexton etc. they hit their run ups. It is a different throw that has to be practiced. The truth is that if your competitor foot faults, it's on you to call it. Simple enough, if you give it over, and that guy beats you, you kind of deserve to lose. If you can hit your foot placement, then it's in your favor to be a stickler for the rule. If you aren't, well, bad on you.
I watched the Stokley vs Brown and Climo tapes, and honestly, if Stokley hit his foot placement is was pure luck. Yes, I thought Climo and Brown were snots, but it doesn't matter, it's on Stokley to hit his foot placement, and he didn't even look. I'll repeat that, he didn't even look. To get max distance he threw himself into the shot with abandon. Go watch McBeth; his foot placement is literally perfect. He's learned the run up and concedes certain things on open field throws but he gets it right. Same with Doss. Wysocki has it easy, that forehand gives him a direct line on the target, but even that is a message, that is, learn a forehand for open field drives.
Clearly, you can hit that foot placement. It's hard and technical. And if you don't have the skill, you might want to stand and deliver. But if you can, well, great for you. And to move into the top bracket, you better learn it.
Last, go watch the Dave Feldberg instructional video he did in Alabama two years ago. He talks about tournament prep. One of his comments is on foot placement out of difficult situations. He points out not to put your heal on the disc because you might lift it off on the shot. Clearly the pros take this seriously.