I don’t think that’s the case. I will happily play in a trad mystery game like Call of Cthulhu or Delta Green, or any number of other trad games that may have a mystery scenario. I have no problem with that kind of play, and indeed, I understand the fun.
But I don’t make the mistake of considering that approach more real. I have recognized that cause and effect in fiction is a construct of the author. It isn’t real. It may be something that guides the author or GM in his decision making… he likely considers cause and effect throughout his process… but that doesn’t mean that cause and effect is actually at play.
Likewise, games that don’t rely on predetermined GM decisions also apply cause and effect. If we’ve previously learned that the widow Barnes was in the company of several people at the Velvet Room, then we know she can’t have been anywhere else during that time. Cause and effect still matters in informing the “facts” of the case.
Neither one is good or bad, and I know you accept that… but neither is actually solving a mystery.