Humans are a fabulously successful species, we live in almost every ecosystem. No doubt about it. Are we the most successful? Probably not, depending on how you measure it. There are way more bacteria by numbers and biomass and they do live in every ecosystem, even ones we don't. Also, there is not chance bacteria will manage to make themselves go extinct.Wow. You don't believe that intelligence is a functional advantage because it took too long to evolve?
So you don't believe that intelligent people have an advantage over less intelligent people because 150 million years ago dinosaurs only had rudimentary intelligence?
So let me ask you again... do you believe that intelligence is a functional advantage? Or do you believe being stupid offers the same or more functional advantage over being intelligent?