Posted 2015-January-15, 20:42
Cappelletti gets a bad rep on these forums not because 2♦=both majors is unplayable, but because 2♣=both majors (Landy and many later conventions) is much superior: advancer can bid 2♦ with equal length major suit length and play in the longer major, making it safer to intervene on 5-4 shapes, and drawing less of a roadmap when they get to 3NT anyway. Cappelletti would be worth playing IMHO, if natural were the only legal alternative. Competing on major two suiters is important against a strong NT and absolutely essential against a weak NT, though it can work out badly (as can any other method: we're interested in how it does on average).
An aside: great news that Multi-Landy is apparently going to be GCC legal, assuming the BOD doesn't reject the recommendation. I would have preferred "any NT defense legal", but this would be the next best thing.