Is nonduality a philosophical claim or a mindset?

In the meditation community it is often claimed that "everything is one", that "we are all the same Spirit", that "there is no separation". (Among other things, the book _The End of Your World_ by Zen practitioner Adyashanti makes this claim many times.) What is that supposed to mean? Sure, sure, it's ineffable and beyond language and all that jazz. But what I mean is: _What are the implications? What are the ramifications?_ Does it have any? My impression so far is that nonduality is not actually a philosophical position. It is not a claim that can be true or false. It does not have pragmatic ramifications. Rather, as far as I can tell, nonduality is a _mindset_ or _perspective_. It is a way of viewing the world, and this _way of viewing_ has ramifications for one's subjective experience - it can lead to the reduction or end of suffering and to states of bliss. (This is conjecture. Personally I have not been able to _experience_ nonduality as anything other than a confusing thought.) Is this correctly understood? Or is nonduality an actual philosophical position? If the latter, what does it imply?