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So basically, if they're going to change the marking rules to make it so there is only one lie with no flexibility, then go back to the old rule of using a mini to mark at the front of the thrown disc every single time. No more leaving the thrown disc as the marker.
It's good to review the history so we don't
inadvertently repeat it. However, not all progress is a straight line away from the past. Most often, human progress takes a roundabout route because the destination is unknown until we get there.
Since our origins owe much to golf, it's sometimes helpful to look there for inspiration. The most analogous definition of "the lie" would be that you have to throw the same disc and the disc cannot move from the place it landed until you start your throwing motion. Yank it off the ground and let go.
That doesn't work. So, what is the broader concept? Throw from where it lands. Most of the time, it is clear where the disc lands because it's still lying there. But, where exactly are you throwing from? There seems to be agreement that the forward-most supporting point defines the "where".
If we look back to golf, the ball is put in play from the back of the ball. The forward most part of the club is touching the part of the ball that is (normally) farthest from the cup.
This all tells me that saying that the forward most supporting point cannot be closer to the target than the back of the disc (and should be near it) is just as good an analog as "throw while touching the spot the disc is covering".
Anyway, we don't need to be like golf, so we're free to make the general rule "throw from behind the thrown disc" if we want to - even if it had no analogy to golf. Thus, we can say the original rule of marking the front of the disc (ie throw from the spot the disc was covering) was not anything special that needs to be preserved.
If we make the rule that the thrown disc is always the marker, then the only exception is when the thrower wants to use that disc which is lying on the ground defining the lie (or hold it in his hand to decide whether to throw it or not). For that, there are two possible rules:
A. Tough. Leave it there and use another disc.
B. OK, if you really need to use that disc again, at least don't gain an extra few inches toward the basket.
I don't think the minimal movement of the thrown disc from marking the back of the disc would be a problem. For one, it's a lot less movement than moving the lie a full width of a disc. For another, most throws would not be marked by a mini.
Sure, I'd often need to mark my first drive because I need to use the special disc that gives me the least shortest throw again. And maybe again. But, most of the time most players are changing discs from throw to throw, right?