A killer feature for Strava (or anyone in the social activity game) would be allowing me to setup social rides with my followers/friends. For example, I plan on doing this loop at 8am Saturday - and anyone who follows can hit ‘+1’ and let me know I’ll join. Where I live, everyone does similar road rides, but won’t coordinate times which would be a great social opportunity.
There’s no messaging or ability to setup casual rides - and if community is a key pillar for them, it’s a huge way to move further up the activity stack to planning activities (which they already have some basic functionality for mapping and planning routes for yourself).
As another poster mentioned, there are privacy considerations but make it opt in and if implemented well would be a killer feature to lock in community as a pillar (and moat). I’ve been thinking about this a lot lately. FB is trying to do this with community on WhatsApp. Someone please eat their lunch. Anyone.