If that's the case, then how stupid must the rest of the world be for not adopting LTC and making it the #1 crypto?  I mean, if it really is that much better and all... everyone has had ~8 years to notice it.  Surely Bitcoin should have been left in the dust by now if that were the only consideration?

That, or you're wrong.  As usual.

If performance was the only thing that mattered, people would buy mopeds powered by jet engines.  But they don't, because it would involve making sacrifices in other areas.  The trade-offs are simply not worth it.  If you are incapable of understanding why compromises are sometimes undesirable, perhaps it is you who fulfils the role of dumbass in this conversation.