What is your strategy regarding SWARM and portainer?

Upgrading rancher to the last version (from 1.1.4 to 1.6.0) I was a bit surprised to see that rancher propose to start a portainer UI to manage the swarm environment containers.

I have nothing against Portainer, but can you explain this choice and what do you plan in the future versions of rancher for the swarm environment UI ? Do you think to have your own UI or still rely on portainer?

Thank you