Stating the Obvious
I cant help but feel that this article was a very long winded way of stating the obvious!
Where does the myth come from in the first place? I've never heard of it after years of working with OLAP.
The only myth I've heard is the exact opposite.
You sometimes get that special breed of ignorant Relational DBA, expressing shock about how slow the batch cycle time of an OLAP product can sometimes be. (convieniently ignoring the fact that the same can be true of a Relational DB).
You then have to give the standard 'advantages/disadvantages of multidimensionality lecture'.
Interesting that Cobb was at Hyperion for a bit way back - didnt know that.