I tried to explain it through these^ examples. Right now DVD allows stays booked on resale points to qualify for early MM registration. That is not because it is entirely grandfathered, and they can change it if they see fit. I bought BW resale after 2020. Currently I can use that booking to qualify for MM but DVD has every right to take that away. Today I can book Wicked Wind Down on a stay with my BW resale, but that too - DVD can decide to change the way to qualify for that perk and exclude my ability to book with my 2020 resale.
The exchange example has already been disqualified for almost 15yrs. The point I was trying to make there was a perk that I thought would never matter to me could end up mattering as DVD continues to change and tweak the perk package.
When it comes to how DVD offers Membership Extras, they get to choose. Obviously grandfathered resale is different. But the blue card perks that DVD is letting me access with my 2020 resale can absolutely be cut off. They can offer a fantastic 4-6 day ticket deal that only qualifies for stays with Direct or pre-2016 resale.
The trajectory is DVD tightening the differences between direct and resale. Overall, changes continue in that direction. And we’re talking about an ownership of decades. Adding another 150pts to our membership - If I bought that resale, I’d have 200pts unqualified points and 150pts direct. For every perk they tie directly to usage of my direct points, more than half the time I would not qualify. That could be a pita down the line because I do enjoy using the perks.
It’s this aspect and the ability to trade into everywhere for decades that I keep in mind.