the technical abilities to be fast on a reach and control your angle of sailing are still worth mastering as every small gain to be made is worth a while. It is incredible how many boats you can take on a reach if you are both fast and smart.
The sailing world is going foiling mad. Time alone will tell whether it's a good thing or not, but what we can say is that it's fun and fast, and very different in feeling. What is the same for the sailor is that we need to understand a far greater range of sail settings in order to optimise the performances of these boats.