The pursuit of truth is not an intellectual discussion. All the intellectual wealth is mental garbage. Individual opinions are not a yardstick to judge the truth. There is no need to argue or discuss. There is only need to think and reason deeply to realize the truth, which is beyond the form, time, and space.
Until one makes his accepted truth as his yardstick without verification, he will never will be able to cross the threshold of duality because his understanding is based on the ego, is not matured enough to grasp the Advaitic truth, which is prior to his physical existence (mind) which is in the form of universe.
The Guru is not needed in pursuit of truth because the truth has to be ascertained by seeker himself. Advaitic or Nondual Wisdom will not rise from intellectual spoon feeding but it arises only from deeper Self-search to the sincere and serious seeker who has an intense urge to know the ultimate truth or Brahman. The guidance comes from within because the Guru is within. People think Self is the body, they think their Guru also has the body and the Guru would do something tangible to them.
People who are stuck with branded Masters and Guru and takes their Guru’s word as final without verifying the validity of their Guru’s teaching. They are stuck with their egocentric intellectuality, which is the greatest hindrance in realizing the ultimate truth or Brahman.
Sage Sri Sankara says: ~ What is accepted without proper inquiry will not lead to the final Goal. (Commentary on Vedanta Sutra).
Nothing has to be accepted as truth without verification. Nothing is needed for acquiring Self-knowledge of Brahma Gnana or Atma Gnana other than perfect understanding, assimilation and realization of ‘what is what'.