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But even then it's better than natural bidding for slams and Oh sorprise! after learning your amazing conventions I can conclude that it is easier to learn and remember. Just describe your shape, your controls and where they are, then pd bids the best contract he can find. I'm sure it is easier than Kantar RKCB, Inverse Josephine, Criss Cross, Batman & robin , and your zillion gadgets.
Let me make a few points about natural bidding
1) Natural bidding is not a system. Two people can not just sit down opposite each other and agree to play "natural", and expect to get good results (this doesn't stop them of course). One reason Moscito does well is that nobody will agree to play it unless they have discussed the whole system. If a natural partnership were to put as much effort into discussing various bidding sequences as a Moscito pair
has to, their results could be as good.
2) Natural bidding does not have to rely on loads of conventions. Most pairs, in my experiece, play far too many conventions. For constructive auctions in a natural system, the only conventions I wouldn't give up are fourth suit forcing and cue-bidding (I'd also like to keep Roman Keycard Blackwood, but I could live without it).
3) Natural bidding is less easy to disrupt than most relay systems. The relayers may deny this, but again, they will have put a lot of effort into working out how to combat interference. A Natural pair who put as much effort in, would, I think, do better in competitive auctions.
4) Natural bidding is unfortunately very hard to do well
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. There is a need for judgement in a lot of auctions, and it can very easy to miss a slam which a relay system finds without any trouble. And since judgement is a quality lacking in 99% of bridge players, a lot of people will do better playing a more structured system.
All in all I think that a relay system may be easier, but I don't think it is theoretically better. I think if a pair knows their system (whatever it may be) inside out and plays and defends competently, then they will do phenomenally well in all but the top flight.
"Play whatever system like, but make sure it is the same one as your partner
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"
Eric