I think rigidity fits well into the Aristotelian framework.

Too rigid and you hold fast to wrong ideas. Too plastic and you waste mental effort challenging truths that should have been established.

Yes, we don't want to be too rigid in our beliefs, but there's a high opportunity cost to mental thought. I've run into too many hippies who are "open-minded" about whether or not 1=1. We have to internalize some beliefs as true to focus on other things.

I worry some in this community are so used to getting others to reconsider false beliefs they forget there's sometimes a good reason to sometimes have rigid beliefs. Reversed stupidity is not intelligence.