Shouldn't it be the decision of the users, or community leaders, whether they would want comments edited or not?
Yes. And at least some of those users are reading this mailing list :)
But I still get the idea that we will not even have the option to lock comments because some don't want this at all. :-(
It is entirely up to the implementor what and how they will implement it. If I were to implement it, I would make all comments editable except by blocked users, so existing Wikipedia policies against disruption and vandalism can continue to function. Someone else might make comments editable only by their author. It is then up to Wikimedia to decide whether to enable the feature as implemented, request a change to the implementation and hope that someone goes for it, or keep the feature disabled forever without telling anyone why. Given that the latter one is currently happening to the article-validation feature, and that its author (Magnus Manske) is getting visibly frustrated and agitated about it, I fear the same will happen to this feature, and as a result, I have discarded my willingness to implement this.
Timwi