If they had so many neurons, then why did they all go extinct? Can't have been that smart. But seriously, measuring volume to extrapolate density of neurons af

If they had so many neurons, then why did they all go extinct? Can't have been that smart. But seriously, measuring volume to extrapolate density of neurons after a couple hundred million years of intervening evolution seems a bit tenuous, doesn't it? Also, this method wouldn't tell us what brain regions (neuroanatomy) nor their cognitive functions. So how smart they would have been relative to modern therapods seems still quite a large guess.