I like cycling against my previous speed or do a cycling trip guided by a GPX track.

I like to be able to call my wife when I'm on the bike without stopping and taking my phone out (often I cycle without my phone).

Sure, you do not need it like food, but it is pretty handy.

I do turn off pretty much all notifications though. Getting distracted by a watch is annoying.

Obviously nobody needs these devices. I enjoy having the stats.