False.
First of all, it’s a bit misleading to be describing this in terms of mental states: we’re talking about a disposition towards a particular mental state. Something baked in, not transient.
And this is why your argument fails. You’re saying that vision cannot have adaptive benefit if you can conceive of some other thing, let’s say echolocation, that would have been equally useful in a given environment. Well, that logic doesn’t follow at all. Evolution doesn’t care about a solution being unique.