Yes, a light boat needs more beam for the same stability and a light boat with a big rig needs more, that is how we got "square" designs in racing
where the LOA
and BOA are the same. Not really helpful when docking
I really don't think any of those designs are out dated for cruising. A stock rig with a conventional main is easier to handle in the real world and a masthead rig has lots of versatility as well as more hoist for the A sails
. These things work better than you would think, we've surprised a lot of people out sailing and most important for the cruising budget
, the price
is low. Exotics have their place but the premium isn't really justified for cruising.
The Tristar hull is a ellipse, a good compromise between load carrying, soft ride and low wetted surface. Because the hulls work like a displacement boat using relatively narrow beam to slice through the bow wave the stern profile helps reduce turbulence, like a canoe. Too full a forward section makes for pounding and more abrupt motion in waves. The stern also lets the bows with their large reserve stability go over the waves versus stopping the boat by plowing into them.
Looking at Ed's 37XRC design if I wanted to extend the ama sterns I'd stretch the aft sections from about 2/3 aft for about 4 feet but first I'd want to sail a stock Tristar to see how they work. There isn't any reason you couldn't do the Tristar raised deck
to another design if you preferred other hulls.