Yes, "oneness" has become another group-think hive-mind thoughtless meme. However, it appears to have legs... so needs knee-capping.

I said in another comment, experience is everything, and the experience of oneness (selflessness, egolessness, nothinglessness etc) is an important first step in rearranging our inner priorities and how we look at the universe. It is a personal experience, not a collective one, hence is not a "oneness" with anything, it is a "wholeness" of oneself.

Then the journey starts.