> Why don't you enable the option by default?
It might be because no one has never requested it. ;-) Otherwise, no developer might have wanted to enable it since it is still experimental. Anyway, we will need much time and effort to complete the feature.
I think that in most cases, some cookie support is far better than none. Could you kindly enable it by default for the next release? That way less people will undergo the same frustration I did before I learned to set w3m-use-cookies to t.