Now that most all of the big cats have spinnakers, our biggest cat regatta has decided to run only windward / leeward courses...
That happened here quite a while ago, for all Hobie classes. It started at the continental level, but I honestly can't remember the last regatta (at any level) that I attended where there was a reaching leg used.
The rationale is that having the reaching leg takes away one side of the course, making that leg "follow the leader." There are plenty of people who think that reaching can be tactical, and if nothing else, FUN! But, it hasn't come up at any meetings that I'm aware of to "force" RCs to reinstate these courses.