Is Buddhism Nihilistic?
If witnessing is you, why do you witness both pleasant and unpleasant experiences? Why can't you limit witnessing to only pleasant experiences? Why does the experience of witnessing arise and cease without your consent? Why is witnessing limited by your senses? Can you witness sights if your eyes go blind or if there is no light? Why do you have to sharpen the mind through studying and practice to understand complex truths? Why can others trick you, fool you? Why can't the mind be aware of the truth at will?
 Witnessing or awareness is not worthy of being considered as a self as it is conditioned and not under one's control. 


  Hindus define ultimate attainment as truth, consciousness and bliss.
  So if even consciousness is not to be there. And its just literally
  nothing. Doesnt it just seem pointless.


Consciousness and bliss are conditioned. If something is conditioned, it is impermanent. If it is impermanent it comes under the first noble truth of suffering. Whatever bliss you experience in Samsara is impermanent and incapable of fulfillment. Attaining Nibbana in Buddhism is not attaining nothing. It's the attainment of the unconditioned element. It is permanent, peaceful and fulfilling.