I didn't say anything about any actual proposal incorporating slalom. What I was saying is that IF slalom was in the Games then the 1000 or so Olympic aspirants would train so hard over four years or more, and be coached to such a high level, that the level of tactics would rise. Therefore there would be no "dumbed down" sailing at Olympic level.
It could be a bit like top-level bike sprinting, for example, which tests the ability to weave your way through the bunch at incredibly high speed and with people blocking you and crashing around you, like this.\
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It wouldn't be conventional tactics, but it wouldn't be "dumbed down" and nor would RBs, FW, slalom or LT.
The people I know who say that any form of sailing is "dumbed down" are normally the ones who have never done that form of sailing much or at a significant level, and have never won much in any form of sailing.