FWIW, at Canny, we're a giant fan of Missive—the collaboration aspect to it is amazing and very useful! Plus, it looks and acts nice and simple with no overly complicated bells and whistles. Love!
Disclosure: Missive is a Canny customer, Canny is Missive customer
We love Canny at Missive! If curious how we use it checkout our Canny board: https://missive.canny.io
And an example of users interacting with us on feature development through it: https://missive.canny.io/feature-requests/p/dedicated-team-i...