My naval architecture is insufficient so I'm anecdotal.
We could draw a line, not a strait line of course, halving kayaks needing ballast and not. The Solstice Titan is a hi volume yak fitting my big feet, long legs but skinny body for wildlife observation.
Reading blogs before moving to buy, blogs said: BLOWS AROUND IN WIND. That is not my experience. 30L water, 10L in forward hold at bulkhead, 20L with cart tires,frame in rear hold brings nose up a bit for paddling up onto waves while stably sinking the keel.
All paddling is planned downwind, with tide then back at least in an eddy or lee shore. I enjoy island runs similar to gravitational slingshot space travel. On Haro, the ride was typed Frigate kayaking as opposed to the Rock Hoppers.
The rollup factor nis a plus but not the primary goal. Carrying drinking water effectively as effective ballast is the goal.
I was surprised, pleased finding 3 bags unshifted under a light packing of light dry bags: I didn't jam a kotta stuff in there to hold the bags down, the space was casually filled.
Both the V hull shape and SF's quality velco produced.