Adjust elevation calculation
Elevation calculations are consistently way too high. I use a device without a barometric altimeter, and Training Peaks always calculates the elevation for my workouts. These calculated elevations are way too high: often twice what they should be. This is frustrating as it makes the data in the app far less useful.

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Karl Schmidt commented
I strongly agree, the inaccuracy of the elevation calculation makes it difficult for me to communicate with my coach.
Additionally, the elevation correction overcorrects and smoothes out the vert in a useless way. The elevation smoothing should be a user choice where they can set a default an apply it all all their efforts - or just match the industry standard (Strava).
Example: Yesterday's trail run was 15.2 miles
Garmin Connect: +2677ft
Strava: +2539 ftTP: +4275 ft (how?)
TP smoothed: + 1590 ft (why?)