We usually stay in a dedicated 1BR at BWV so I don't know if the wood chair is also in the 2BR lockoffs. But even if the same chair is in the lockoffs, it is lightweight and smaller than an opened sleeper chair would be. If someone needed to move between the 1BR and studio in an emergency (for instance if there was a fire and there were young children in the studio portion) it would be no problem moving the wood chair.
Another thought is that it could be an overall occupancy issue. If there was a lightweight sleeper chair option for the 1BR living area as well as the murphy bed in the studio, the occupancy of a 2BR lockoff could be as high as 12 if they allowed 5 plus a child under age 3 in both the 1BR and the studio. Perhaps that was pushing the limit for the building as a whole. Since studios are the most popular room type and
DVC appears to be trying to appeal to families who will only purchase if they can legally squeeze as many people as possible into a studio, maybe they saw more benefit in increasing the occupancy of the studio rather than the 1BR if they could only increase one of the two.