Well, if you come at it from the mindfulness angle, there are real studies showing that mindfulness works. https://pmc.ncbi.nlm.nih.gov/articles/PMC8083197/ and similarly, if you come at it from the religious angle, you can trace a lot of the aspects of mindfulness back to the Buddha's original teachings as recorded in canon. And if you ask if there is a fundamental point beyond those, I think the answer is that there is none recorded - the best description I have been able to get of Nirvana is that it is a state of perfect mindfulness.