They've been working on that for quite a while and just had a major update to Riot (Web/X on Android/iOS) -- E2EE is now on by default. Have you tried the lates

They've been working on that for quite a while and just had a major update to Riot (Web/X on Android/iOS) -- E2EE is now on by default. Have you tried the latest version? Most of the issues with key verification have been resolved (and now having users you haven't verified isn't as big of a scary warning as it was in the past -- in fact, I believe the default is that there isn't a warning unless there is a device present which a verified user hasn't signed). Also now there are per-account identities which are used to sign devices (the ever-elusive "cross-signing" feature), so you only need to verify a user once.