I think you get the spaciousness that comes with that sort of "flush deck" design (perhaps that's a better term for what you're looking at - flush after deck) Many of the Nauticat boats have that similar feature - but the deck is broken up by the vestigial cockpit.
It's true that large expanses of flush deck can make getting around when heeled more problematic than the normal arrangement ( we owned a flush decked 40 footer and we experienced that "problem" a time or two.) One thing that I've noticed is that some builders handle the transition from one deck level to another better - in those pics you posted the lifelines don't make that transition very nicely (to my eye)
But it gives certain types of boats that "shippy" look that so many like (as do you based on your current vessel!) That idea has also carried over into a number of trawler yacht lines as well, certainly due to the spaciousness achieved below... can you say trade-offs?
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"