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I wonder if the raw data can show any paths/areas missing from openstreetmap - would be interesting to align the datasets

I think that's what their Slide project is aiming for.

And it would seem it is integrated into an online viewer/editor at https://strava.github.io/iD/#background=MAPNIK&map=2.00/0.0/...

I was able to find a few places where I knew there were newer roads that were not mapped yet but strava clearly showed.

zoom in a lot to enable the strava heatmap, and you can edit openstreetmap if you know what you are doing.