The only difference between material science and the science of mind or contemplative science, is that it is an individual journey, and the results can be confirmed by you only. It is completely experiential in nature.
I disagree that this is the only difference.
The difference between making up your own language and talking to yourself, and speaking a common language and communicating with your fellow humans, and working with them to actually accomlish and achieve things, is enormous.
It is quite clear that everyone benefits from advanced in material science—we might not be alive today except for advances in medicine and agriculture.
Material Science is also experiential—but the experience can be shared/confirmed/improved by others.