I never had first-hand experience with force-touch before, so I thought it would be an useful feature. I'm using it mostly for moving cursor and occasionally to preview web pages by force-touching the link. Also you can force-touch notification and e.g. type answer immediately, I don't actively chat, but I imagine that there are people who will find it useful. Anyway now I don't think that it's a very useful feature, but it's nice to have it.