Flying an open cockpit airplane versus a cabin airplane is like the difference between a car and a motorcycle, but without the traffic. There is a sense of oneness with the machine and the environment. A small, single-place, open cockpit airplane accentuates that even more.
From time to time, the FAA changes the qualifications for a license or rating and even adds a new designation of pilot. Steve Phoenix has made a study of the pilot population and gives here his recommendation for a new category of instrument pilots.