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There are only a few problems with your theory

First of all, if what you say about comb filtering is true, most actual musical instruments which radiate HF far more omnidirectionally than most loudspeaker systems suffer the same problem, therefore comb filtering would be more accurate, not less. Secondly, there are 10 million resonance frequencies in the audible range in most rooms, comb filtering at HF would not significantly alter that. Thirdly, most HF is the result of transient attacks, not steady state sound so that by the time the reflected hf component arrives, the direct one is gone so there is no comb filtering. Fourth, by using an array of indirect firing tweeters, the frequencies at which comb filtering occurs resulting from any one of them and the front tweeter will be different from the others and in aggregate each one will be relatively insignificant.

Your conclusion is not borne out by nearly 20 years of experimenting with this technique. I have yet to find a single loudspeaker system to which it is properly applied which cannot demonstrate a marked improvement in subjective accuracy and reduction of shrillness at treble frequencies. And as evidence, I have a collection of violins which are heard live frequently and a large collection of violin recordings. These recordings and others just sound more accurate to me using this technique.

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