"Ignorance is bliss" usually has a negative connotation, a way to refer to someone who is ignorant on some topic that someone else has deemed very important (sometimes meant as an insult). In my view, ignorance can be a positive thing when it comes to most topics. It's not so much about a lack of information on a topic, but more so about selective non-investment in what others consider as very important. We are products of what we pay attention to, and given the sheer amount of information in the form of news, media, entertainments, and legitimately interesting things that are available for us to consume in the modern age, it's more important than ever to be selective in what we pay attention to.
For example I really could not care less about football, celebrity news, daily political controversies, social media influencers, and so on. I have zero interest in these things and I certainly don't have my identity anchored to them. What may seem as obviously important to you could just be background noise to me. Yes, ignorance in the things I don't care about is bliss. My attention is finite, life is finite, so I choose to spend me time focusing on what I see as important or interesting - and it's fair that others may see what interests me as background noise.
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