Regarding both the static hero stuff and the flawed-to-unflawed character growth, the stuff you are writing does line up with what I was getting at. (This isn’t unconditional approval of what you said, but you seem to have gotten the point.)
But this is stuff you should have already known. You are familiar with Popper and BoI. It’s a pretty big error to be making, given that. So I think it betrays some of your deeper, subconscious thinking that is probably getting in the way of your own personal growth and learning. For example, if you see the goal of learning or growth to be that you should reach some kind of unflawed end-state, that is going to lead to counter-productive learning behaviors.
So it’s good that you are able to consciously see the issue when it is pointed out to you. But you need to actually understand and integrate the ideas more so that you can use them in your thinking and apply them in your own life.