This is also what has happened within Advaita Vedanta over the past 14 centuries. What is called traditional advaita has betrayed the original teaching of Shankara with a profusion of conceptual intricacies which detract from his original intention. It has become, by and large, an intellectual exercise.
“There are no ‘right thoughts'” means there are no right concepts, not even that of ‘Brahman’, simply if one stay with the concept, which is just a symbol. A work of deconstruction needs to be done, and that is precisely ‘apavada’. A first step would be to realize that mind is not ‘mind’, that it is not other than consciousness, and then that ‘consciousness’ is not ‘It’, ‘That’. Everything is sublatable except the experience (I dare say) of the inexpressible, unnameable, unfathomable. AM
From recent posts in Advaita Vision.