You realize the original post isn't talking about people making multiple ADRs...just changing their minds. For me, I might change my mind because I start reading a lot of positive or negative reviews about a place or because a family member lets me know they really like or dislike a place. Most likely I will change my ADR because Disney changes park hours or the only time available for a coveted FP+ conflicts with my original ADR.
Yep, I'm very aware. And I answered the question. I would be happy for it to be implemented - because of the residual effect of curbing ADR hoarding.
We rarely ever change our minds, so it wouldnt affect me except in that it would curb a practice that I personally dislike as a result (hoarding ADRs.) I'd happily give up the ability to change my mind to stop that! We have only ever cancelled due to extenuating circumstances (flight changes, hurricane, illness, etc.)
As I mentioned in my first post, we determine the few places we want to eat before we book ADRs. We don't stray from it. If we get them, yay! If not, we wait and see if it becomes available. And maybe we'd have a better chance of getting it right off the bat.
(Edited to remove the part about TP reservation finder because it is irrelevant - remembered that if people were not allowed to change, this tool would not be very useful. It is useful to me right now while people can change to their heart's content.)
I am not implying that OP hoards ADRs. I am saying that if this was implemented, I would like it very much because we don't change our mind anyways and as a result, people couldn't hoard!
I know my opinion is unpopular.