I am veey opinionated. I report that I don't think something is good at times, but I report that I don't have good rationale for that and as such, my opinion should be disregard unless I manage to put together an objective line of reasoning.

Sometimes, the line of reasoning is there but it's too small.

Other times, when I put it together and write it down is big enough to show that there is a lot of value in doing what I suggested.

So being objective pushes toward challenging your own ideas, if they are still ahead the "competition", there are usually really good reasons.