this button looks more logical than the current mode with its down arrow in disagreement with the publication and as you say is perfect since one can say why is giving the negative vote in a personalized comment.
I imagine that this button will have to graduate our negative vote from 10% to 100% depending on what poncetaje we want to give or at what point we want the publication to go down either by plagiarism or violating the term of steemit.
Undoubtedly I like this version more, although with this button more visibly in the eyes of a lot. It will increase more negative votes this is my opinion.