The implementation does appear to be a bit hit and miss:
1. There is no offline OSM support on mobile devices (IOS/Android etc) - this is a killer for me as my trails take me out of cell reception ...
Yes definitely needs this and also offline maps support, there are often times We need to check the map but with no cell signal.
Yes! Strava needs the barometric altimeter support for iPhone 6/6+ abd relevant android phones!