Why would you not want to buy in the Trust? My understanding is that the trust just gives DVD more flexibility with how they structure units, declarations, deeds, etc. How would the trust make owning there worse?
For me, the biggest thing is that they have given themselves specifically the right to reallocate points across units, which they have tried before (see the Treehouses), but have also been pushed back on (see
point charts lock-off premium fiasco of 2020) where total amounts of points in the resort, and specifically in each unit, as ownership is defined as % of a "unit", so if they changed the amount of points, it could technically change one's percentage of ownership.
An example is this. Suppose DVD were to tear down Aruba at CBR and build monstrous (but wonderful) 4-bedroom "Mediterranean Villas" and attach it to the RIV association. Now, let's suppose they make those say 200 points per night. The way that many interpret the deeds as they existed prior to the Trust is that DVD cannot then say make those "Med Villas" 150 points a night and distribute the others and say make the existing 2 bedrooms and Studios all say 5-10 more points per night.
The easiest thing to see this with is with the BPK addition to GFV as it was only declared into the association in 2 units, each consisting of 889,911 points (for a total of 1,779,822 points). Each "unit" was a declaration of 101 rooms. So, those rooms (all Resort Studios) for the "unit" are 889,911 points. Theoretically, to fill those 101 rooms for the entire year, should be 889,911 total points. Now, say you bought 150 points in one of these units, lets call it "Unit X". Your ownership in your documents would be expressed as a percentage of this. So in this example, your 150 GFV points would be expressed as a .000168556 percent ownership of "Unit X". OK, so say they add units to the association and reallocate to make the resort studios more a night. Now, your percentage ownership would be less than what is recorded in your deed.
With the trust, they explicitly allow themselves to play this game. That is why I think that there is additional hesitancy from certain persons ("raises hand") to purchase into CFW as there is not a guarantee that those point values for the Cabins will remain as they are as they allocate more into the trust, and also why you see many stating that Fixed Week purchases there may make more sense in more ways than one. There are a lot more nuances to this (you can talk about "Base year variations" and even in the trust subdividing into "Use Plans", but then you are really going down the rabbit hole), but they are good to know so that you really know what you are buying.
That said, I think that I tend to agree with
@Brian Noble that the number of people who actually have this as a concern are a small subset of people that are on these boards and that the general population doesn't even think about it...