I have a completely different view of these new foiling cats.
I was right there watching Art Piver developing his trimarans on SF Bay, and Rudy Choy doing the same with cats in Hawaii, all the while sailing what are now known as the 'old classics' around the bay, down the coast and to Hawaii.
Then there was this little 27 footer (a Thunderbird) with hard chines (and a nearly flat bottom), a reverse transom and a spade rudder that was more fun than a barrel of monkeys to race around the bay. We left all the 'old classics' in our wake. She had no shear, was built of plywood and the old salts made comments similar to the OP of this thread.
Fast forward to the last America's Cup races on my beloved Bay, and the boats are sailing X times faster than the true wind speed, reaching speeds around 50mph, at times. How exciting it must be to be a part of such technological innovations. How badly I wanted to be young again, and be offered a slot on an America's Cup racer, as I was half a century before.
Most of us will never see this tech filter down to us on our cruising boats, though small boats like the Moth are available for those bitten by the foiling bug.
IMO, in their own way, these huge foiling cats are every bit as beautiful as old Nat's classics. I see a grace and beauty in these boats. And the pure exhilaration of that kind of sailing has to be a bit of an addiction.
To say this is not racing or sailing is a pretty narrow view of our sport, to me. But they said that to Art Piver, Rudy Choy and I even said it about the first few plastic boats I got to sail, way back when. Hell, they didn't even smell like boats! Yet, here I am, 50 years later, sailing the West Indies on one of those "plastic fantastic' boats, as we used to call them, and loving every single minute I am NOT spending maintaining my cruising home as I would be doing, if I was sailing an 'old classic'.