wait, what? I used to be on Fi and I used Messages and RCS without issue. I would not be surprised if google fucked things up here, but I’m also surprised Fi still exists.
that’s wild, I don’t understand how they so consistently screw up messaging. It seems like Fi went from being a seamless experience (hangouts integration) to an afterthought.
It has to do with RCS encryption. You have to disable RCS before syncing with google fi because google can't intercept and display your messages if they're encrypted. It can sync unencrypted MMS or SMS just fine.
Personally I prefer google not destroy encryption of a new standard for convenience and if you don't care you can use the old standard.