Having never used a leading reservation, I did not give this policy much thought; now I am concerned. A lot of people do make split stays because they can and want to, but sometimes you have no choice.
Spit stays is not a business problem Disney wants to/needs to solve. - it does not cost them anything.
The big problem was the leading reservations. You could book an entire week before your actual trip, get a 67 day fast pass window, and then not HAVE TO cancel that first reservation until what is it, 4 days out? That could be a very large number of rooms coming out of inventory then being put back into inventory on short notice, giving Disney little chance to rent them. Potential a big hit in $$$. This had to be solved, and they did.
Now, being an IT guy, my GUESS is that there was nothing in the system to support this new needed functionality (exempt
DVC rooms from these restrictions), and the business did not see or think of the need - maybe they will add it, or maybe they won't. Really, if you have enough points, what is to stop you from making a leading reservation with DVC, then cancelling it outside of 31 days so points to not go into holding? If you have the points you could jump thru the exact same loophole!
Hopefully they will change this.
On a more positive note, I am doing 1 day at the All stars then moving to beach club the next day for my stay. My FP window opened yesterday for the first day. I was not able to make fast passes for the rest of my stay, although I "should have been able to", but I was able to make them for my day at the all stars. I was able to get one for FOP. I have never been able to get a FP for FOP on the first day of my trip, I always had to go out a few days. This morning when my second window opened, I was able to get another FOP one (canceled my first, changed park plans), and had the option for a slink dog one.
My point is fast passes do seem to be getting easier to get for FOP, Slink Dog, et all.
Just don't do a split stay when Galaxy's Edge opens!!!!!!