Every time I see one of these no-transom designs, mono or multi, going down the ICW, it reminds me of that old commercial for the AMC Gremlin, in which the gas station attendant looks at the car and says to the driver, "Where's the rest of your car, toots?" -- they look incomplete.
Racing boats are *not* discussed in this post -- they are a whole different class of critters -- I'm talking about cruising boats.
Good enough for marina-to-marina cruising, maybe, but not open water, where the wind can back 90 degrees and rise to 50 knots in no time, whipping up a cross-sea that has the Ocean standing on her hind legs and blowing the tops off whitecaps. I would not feel comfortable further from shore than I could swim back to in one of these "unfinished" boats.
I see where hybrids are available (on monos), with drop-in boards & station-wagon-like tailgates. If engineered strongly & simply enough, they could be the best of both designs. Don't see anything like that to fix the 'back porch' look of the multis. Yet.