No you're right, this is just my POV, but I have many data points as I travel AA F a lot in the US and often look at same day changes. Just like the 7 hour delay in this thread is one person's POV and a single data point.
Back to my experience -
<24 hours before I see lots of F seats.
Once 24 hours hits, it's zero.
My argument with the same day change is it's relatively useless because you are locked in - nobody can change, therefore nothing is gained or lost. And yes, I see people with gate upgrades on flights that I knew was sold out - but if the GDS is saying no seats, the website won't let you change your flight (same deal with re-accommodation, unless they are going to proactively get in there - which is what I was suggesting they do in my first post).