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It's not as if there is no scenario where calling riichi might be reasonable when in tenpai for a yakuman, though. For example, one of the rules of the Suu Ankou yakuman is that you cannot ron unless you already have four concealed triplets (i.e. you are just waiting on the last single tile; not waiting on dual pairs, either of which could become your last triplet). In the case that you do have a dual pair wait, then, you must tsumo for the yakuman, in which case it is advantageous to delay your opponents from winning as long as possible (so you have more chances to draw your winning tile).
Riichi does have the property of broadcasting that you are in tenpai and thus making it less likely for opponents to deal into your hand, that is true. However, the other characteristic of riichi is that it makes your opponents more likely to give up/not try to win. The advantages and disadvantages of these two factors are what must be carefully considered whenever one has the opportunity to riichi (in addition to the yaku/extra points, of course).
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