What upsets me about this thread and many threads on this forum is how some neglect a basic reality that underpins most cruisers mentality when thinking about boats. This reality extends across all classes be it monos,multis or motor.
There are good seaboats and those not so much.
Comparisons between classes of boats is foolish if not also accounting for if that specific craft is a good or bad seaboat. Grand Banks are wonderful, beautiful, comfortable great loop or coastal cruisers. Sea rays give great bang for the buck. Neither are designed to be or are expedition yachts.
You can blow big bucks and get an light ice Diesel Duck 492 for less than the glorious GB but only the first is the rtw boat. You can quadruple the purchase price and walk on a Seaton or Cape Scott and get the bling with the sea keeping ability to sail the Southern ocean.
The same occurs with monos or multis.
Looking at the title of this thread believe we should be looking at specific boats and critiqueing that specific design. Multis have several vulnerabilities as do monos or motor. This obsession about inverting limits this thread to one of many concerns so is much less informative than it could be.
Look at the various cats you see in Caribbean charter. These are like the Searays. Even in that relatively benign setting one sees:
They hobby horse. When motoring to windward( such as entering an anchorage) this is so extreme as to be dangerous to the occupants. Their beam to length ratio is moderate but capsize risk decreased by moderate rigs. They aim toward one level living with large expanses of glass. But a violent pooping may result in failure of the aft glass enclosure or its rim of support leading to down flooding. The steering is designed for the stresses of forward movement. Falling backwards after being stalled on the face of a wave may result in catastrophic steering failure. Interior living space is optimized for pleasant living at anchor with bridge deck forward of the mast and beam of hulls brought forward to allow a four berth set up. Beyond unpleasant burping the behavior in a seaway is compromised. They have low aspect fixed keels. Beyond decreasing ability to point increased possibilities of “tripping” on a large wave face is increased. Helm position is high and exposed. This is tiring to the helmsman and compromises ability to see the whole boat.
Now compare this to a boat designed as a seaboat. Perhaps the Rapido 60referred to above.
Single rudder. No linkage issues. Very fine hulls and very wide beam with much more force required to turn turtle. No significant structure beyond central hull before the mast. Daggerboard no fixed keel. Protected helm station. Walkways and rig designed to be worked in a seaway. No large glass expanses vulnerable in a pooping or from green water.
In short just like a Diesel Duck would seem to be a better seaboat than a Searay the R60 would seem to be a better seaboat than the charter cat.
I see you have read Chris White's Cruising in Multihulls book. It is a good start, but is pretty dated now, and only represents a single viewpoint among many different ones from very qualified designers and builders.
I have avoided responding to some of your posts in other threads because your information is just too twisted up and poorly presented to try and untangle and add context.
But I would like to point out here that your assumptions about, and categorizing/grouping of, production catamarans and their designs is just wrong on many, many levels. I could spend a page or two just unwinding this post. Like how a good sea boat should have a single rudder, and that single rudders do not have any linkages to fail and that a very wide beam is good. Good grief - that is a general lack of understanding of catamarans, steering systems, and dynamic stability.
Production cruising catamaran designers and engineers include Morelli and Melvin, Marc Van Peteghem and Vincent Lauriot-Pr
évost, Eric LeRouge, Jeff Schionning, Angelo Lavranos, Phil Southwell, Alex Simonis, Kurt Hughes, and many other extremely qualified people. Many of their designs and philosophy are in contrast to Chris White's, and they have a more extensive portfolio and experience.
I suggest you take your good start at understanding catamarans and their designs (his book is where I started), and allow yourself to push further into the topic with a more open mind. A lot has developed since 1990, when Chris White wrote his book.
BTW, do you realize that more Chris White catamarans have capsized than any other builder/model? That isn't even taking into account that there are 100 times fewer Chris White boats than other builders. While the total number of catamaran capsizes while not racing is extremely small, Chris White designs do hold that record.
FWIW, I like Chris White designs.