[zimpenfish]

> Many professional endurance based athletes also do not track using GPS for similar reasons.

That might need a citation. They might not be using Strava and posting them publically (although a lot of pro cyclists do) but instead use something like Training Peaks for communication with coaches etc.

[Humdeee]

I would wager that many, many more professional athletes and teams all over the world do not use GPS over those that do. Do you really see the thousands of coaches all over the world backing up their athletes data to the cloud or using some company platform and making sure every workout is on private mode? Or do you see pen and notebook, excel docs, and local hard drive folders full of manually written logs? The world extends far beyond the borders of 'mericuh.