Facebook and Twitter provide strong evidence that people will use reactions. I see no reason to expect that user behavior will differ when they want to express negativity. Facebook's decision to not provide this feature has long been rooted on the pretense that people will use it. That is the basis of this thread: that people will use it instead of commenting.

Also, it's really easy to disagree with what I wrote without suggesting I am naive.

> Also, it's really easy to disagree with what I wrote without suggesting I am naive.

Hence proving the commenters point about negative comments :-/

Users are also lazy (I know I am). Give them a two-click way to do something, and they'll use it over a click, emoji-hunt-and-type, and click.