It's easy to match with other colours and can be rendered 'invisible' when you want it to. A black rectangle doesn't stick out as much as say...a bright orange rectangle. The 17 Pro looks awesome in orange, and I want it in this moment, but colours go in and out of style and most people see their phones as tools.
Ultimately I like different colours based on my mood, but for something I carry with me every day and almost everywhere it's simpler and safer to pick the plainest colour; black (or grey). Perhaps it's risk aversion.
As for heat; I live in a place that regularly gets to -40C, so any additional heat is much appreciated! Seriously though, I don't recall the sun impacting my phone's temperature levels, unless I was using it in a phone holder to navigate on a hot summer day. Even then, I doubt a white phone would fair much better.
Ultimately I like different colours based on my mood, but for something I carry with me every day and almost everywhere it's simpler and safer to pick the plainest colour; black (or grey). Perhaps it's risk aversion.
As for heat; I live in a place that regularly gets to -40C, so any additional heat is much appreciated! Seriously though, I don't recall the sun impacting my phone's temperature levels, unless I was using it in a phone holder to navigate on a hot summer day. Even then, I doubt a white phone would fair much better.