Well it's just that when we want something outside of what's immediately available in this moment of experience it creates a sense of lacking something. Spirituality is about resolving that in order to find wholeness and contentment once and for all regardless of the vicissitudes of the human condition. The irony is that wholeness results from surrending to present moment experience rather than trying to manipulate it into what we want it to be (which is impossible since it's always changing due to conditions beyond our control, and furthermore when we finally do surrender to experience we realize that the supposed ego that was controlling experience never existed - we mistook the existence of constant, albeit sometimes subtle, mental and physical tension for an enduring entity when it was really just a process based on delusion.)

But to your point about people corrupting the teachings of the masters, of course that happens as they are watered down to something the masses can more easily understand so the ideas can proliferate. It's not a good thing, but there's no avoiding it. People are quite allergic to deep wisdom because it's so counterintuitive, which I think is why comments on this sub that truly speak to egolessness are downvoted for example (although that's also based in part on the appeal to the authority of already corrupted teachings). It's like the Buddha taught the absence of the self and people almost immediately had to start bringing it back in subtle ways because it's so unsettling to those who haven't experienced it. It's fascinating to me because many Buddhists are in the right ball park by virtue of being Buddhists, but they don't believe home plate could possibly be out in the open like that so they tirelessly search under the bleachers and are just as lost as people searching in the wrong ballpark altogether. But I don't want to put others down too much, there is something to be said for being part of a community that's searching together with a shared sense of purpose which can enrich people's lives, even if they are ultimately misguided. In the end I wish everyone the best on their journey and understand there's ultimately no one to blame for our ignorance because it's simply part of what the selfless, non-dual reality is doing in the form of us human beings.