Forming opinions should not need anything yes, however promoting or publishing that others will consume should be based on stronger foundations don’t you think ?
I don't disagree with the spirit of your argument and lived experience should not trump all, it should have only some weight and other points should qualify their statements clearly.
We live in the age of disinformation, influencers, and anti-intellectualism that actively dismissive qualified sources, we have to put value in source quality, while not completely dismissing the ones without them.
Our personal opinions govern how we interact with others.
The alternative is greater ignorance.