The Tacticat game is a good example that sailing skills and a little luck go a long way.
The Capricorn is IMHO the fastest platform, followed closely by the Tiger and Infusion by lower margins (Judging from the various results).

What you're seeing now is that Hobie doesn't change its platform but instead invests more in sail-development and fine-tuning (Either through the factory or the sailing community).
IMHO the problem with formula sailing is that if you want to stay competitive as a non-pro sailor you are forced to buy a new boat every year, or with every iteration of new material. Something that people without sponsors will not be able to afford. Which is probably the same reason why you see so little A-cats (2nd hand A2=€18K!).