I dont think its a big loss to the universe if humans go extinct. Humans didnt engineer the biochemistry of life or produce the atmosphere or the over rated buggy brain.

I fail to understand this line of thinking.

Even letting aside any survival mechanism we have there are two rational posibilities:

1. We are alone in the universe => super huge loss of complexity and consciousness

2. We are not alone but at Universe scale intelligent life seems rather scarce => still huge loss in diversity