You cannot design a resort with all the rooms for 5 adults at a standard design with two beds, one bathroom and one door. 5 adults in an entire resort cannot safely evacuate in one corridor without going to large suites.
As an architect, this cannot be done.
Also, to the OP, you can wish all you want, but it can no longer be a moderate if you accommodate larger parties. Then it becomes a deluxe, with larger spaces, more exits, and larger corridors to accommodate adults, not a combo of kids ans adults.
You. Can ask the question 60 days to Sunday, but it is still the same. Design of a hotel/resort falls to the mass market and any other party size does not make money for the stockholders. This is not a Motel 6.