Except at RIV even the same amount of points get you less.Absolutely less points will get you less. But, once a home resort is chosen, you live with that decision for a long time. If, one is debating what to buy and the yearly cost of MFs if of concern, then I was just suggesting a way to compensate.
The cost to buy In is just too expensive to choose a resort that is not your first choice because of the MFs difference. Getting into RIV will be harder than AKV so while owning 15 points might mean you loose a night every other year, owning at the resort you love, to me, is worth the reduction.
Which is why I simply said all the pros and cons need to go in to your own decision. I don't think anyone can say for certain they "love" RIV yet as no one has even stayed there yet. Which is why I was suggesting to wait.
I just want to add the OP also gave 1/3rd of their reason as the resort being new. That will only last roughly 5-10% of the contract length. At which point it will have to rest on its merits of quality, location, park access, and extras to whether the 11 month booking window for rentals matters (which was another 1/3rd of the reason).