Sensation and perception is a limited view and also the only point of access to reality we have. This said, then, we should think it is important. No sensation and perception necessarily means no understanding of and no interaction with reality.
This is, of course, if there is another reality that is unknown. But why complicate things when one reality is already complicated enough. Reality has no cause for being more complex than need be.
The onus is on others to explain why the metaphysical is needed.
I am happy with a mechanistic explanation of us. That the illusion of a self or rationality should be no less plausible than phenomena or representation. To react against the physical reality is really an unnecessary fear that brings about more grief than relief.
As a Buddhist correct understand brings about relief. The explanation is not that different to a philosophically material monist one. The self is not what it seems. A soul is as plausible as a non-soul. To discount non-self is not scientific, not open-minded. It is foreign. It is The Other.