From memory (which absolutely is not my strong suit) I think I ended up with this line thickness because it was the thinnest that still maintained readability when overlayed on busy maps (eg city centres). Though thinner but with a stroke colour could work, but I’m think MapBox SDK doesn’t support that yet.
It’s certainly worth experimenting with again though. Those decisions were made 4-6 years ago! Plenty might have changed since then.
Yeah I barely even try to look at the activity map views for my walking. It’s really not readable. Though a big part of the problem for me is the areas of the city where I walk are separated by substantial distances, so there’s dense clusters of walking in separate parts of the city. There’s no way to view the map with all of those separate regions visible, without each of them shrinking to a useless size.
Anyway, it’s all worth experimenting with, so I’ve added it to the todos to see what works better.