There are many 55 ft boats that can be easily sailed by a couple even solo.
I know Dashew and others have been making large boats that can be run by a couple or solo, but those solutions have the problems I mentioned. The complexity of the systems, with thrusters, power winches, generators, zoned air conditioning, and much more, all add up to the fact that the boat is far less "personal". It's not just that the large boats are expensive. They either take a lot of crew (management problems) or they have labor saving systems to allow short crew. The labor saving systems leave the skipper highly subject to electromechanical failures (cannot raise the sail w/o power winch) and are too complex for a single skipper to self-maintain.