Your reply is subterfuge. Of all the things you mentioned about India, similar things exist for Pakistan, China, USA you name it. Point being: countries have territorial claims and most are resolved one way or another.
Having said that, was partition "perfect" - we all know it wasn't and neither was the mechanism or timeline. However, I don't see people of any of the non-Kashmir states revolting. In fact, its Baluchistan and KPK - areas which many can claim Pakistan "annexed" which have a situation.
I will state this again: Has India claimed any lands geographically in the last 20-30 years (if not more) that will prove its "Akhand Bharat" designs?
I do however believe that the mindset of Pakistanis (not all but some significant portion) that India wants to usurp Pakistan or doesn't believe in legitimacy are causes of continuous conflict. And IMO, its self-inflicted pain.
India has treated Pakistan as a sovereign nation. India's PM went to Minar-e-Pakistan, embraced his counterpart only to get Kargil. Still, India's stance towards Pakistan's sovereign integrity hasn't change.