The good thing about Steemit is the keypairs it generates are random so changing it so frequently isn't a huge deal. Some groups actually now discourage against frequent password changes in other applications. The reasoning is that the more often you have to change it the more annoying it is for you and the more lax you get in creating said password. Thus you tend to use something that is easy to remember and change, but also easy to guess or crack. I agree with you though, we all make mistakes, but we should all also be changing our keys more frequently. Especially when there are actual funds tied to it.