I'm a 60 year old competitive XC skier, so I use the VA3 to make sure that I am in my target zones while training. I don't look at it much while racing, because I'd probably scare myself at how high my heart rate is.
During the off-season, I use it to track my bicycle rides (speed, elevation, heart rate) and overall fitness (steps, stair climbing). I used to own a Samsung fitness tracker and the Garmin is much more accurate and has better battery life. That said, I don't use the VA3 for backpacking trips because the battery won't last more than 10 hours on one charge while the GPS is running. I just track steps and stairs instead, which gives me a general idea of my hike.
So yes, some of us do use a certain set of features but it does take a few weeks to figure out how to best use the data. Each morning I spend a few minutes looking at Garmin Connect to see how I'm progressing, and I'd say that the VA3 has done a decent job keeping me on track with my fitness goals.