Everything is a tradeoff
The writer of the blog makes some good points. Not sure why smaller boats need defending - nontheless, he makes a good case in their defense. Some of the benefits of experience in smaller boats are undisputable. I firmly believe that you really learn to sail in smaller boats. My father and I learned in Snipes, 15 1/2 foot racing dinghy, not at all difficult to knock down. You learn the feel of sailing from that, not from sailing yachts. You learn how to avoid situations you don't want to get into with a sailing yacht, and how to get out of them. Dad boats moved to a Seafarer 24, then progressed in stages in various Paceships, Contessas, Catalinas, and finally a Camper and Nicholson 35, and I count as a blessing the opportunity I had to experience them with him. Dad ultimately lived aboard a 32' for 10 years - 5 years in Europe, then the ocean passage to Barbados, and the last 5 years in Florida.
We all are more than a little nervous around the guy who buys a big boat and doesn't have the experience to handle it. On the other hand, boats of any size make me nervous in the confines of a marina, when they either don't have any concept of the forces acting on a large sailing yacht in close confines, or just don't care. Sometimes makes me wonder if they pull onto the tracks in front of even a slow moving freight train, and expect it to stop or otherwise avoid them. They simply don't understand that in the close confines of a marina, the large yacht skipper simply has to constantly judge the current, wind, depth room to maneuver, and other traffic, and can't simply turn or stop on a dime, or hold out a hand (heaven forbid!) or a boat pole to fend off a dock or another boat. Hopefully, the skipper understands those dynamics and keeps his options open at all times, and the vessel under control.
The writer also makes some very good points about the economics of boat size. Pretty much every cost goes up nearly exponentially with size, and so does the work load, under sail or for maintenance.
There is also another perspective that the writer does not address. Sailors are not all alike. Some like to take the boat out just to sail it around for an hour or so. Others like to cruise for the day or the weekend. For some, sailing provides something other than the experience of sailing for the sake of sailing - it is both the ends and the means. Sailing offers a challenging, liberating, inspiring and satisfying way of life for extended cruising. Regardless of the size, sailors have lived aboard and cruised the world in boats from 23' on up for decades. Some are perfectly happy with the bare minimum of a spartan environment, and simply enjoy being as close to nature as possible and still survive. Others might prefer more comforts, but don't have the means to support them. There are still others who may feel that some of those comforts do not have to be sacrificed, simply because they cruise under sail. Maybe they, too, have to make tradeoffs, maybe not. Maybe they have to choose between owning a home and owning a yacht.
The common thread in the most insightful posts I've seen is that the sailor needs to develop the skills and experience to handle the vessel they sail, regardless of the size. And that includes all weather and circumstances. None are either right or wrong based solely on the size of the boat they are sailing.
But, I do agree - you learn to sail in small sailboats!