In reply to jkarran:
I completely agree with your comments about rain – most touchscreens still go all over the place if they're covered with water droplets. However, in all but the heaviest rain this is usually as simple as wiping the phone on your jacket sleeve and carrying on.
While normal gloves make using a touchscreen awkward or impossible, it's trivial to get touchscreen-compatible gloves. Some mountain-specific gloves even have this feature and I can confirm that it works perfectly well. (However, as stated in my post above, it's still a bit more awkward in winter when you're using thicker gloves and probably wearing them all day. That's why I still prefer a traditional GPS in winter.)
For hill use, it's a good idea to get a waterproof smartphone, such as the Moto G3. There have been many models available for some years now. Some are even shock-proof.
"Remote areas with poor reception kill batteries too." <– This is an example of user error. Engage Airplane Mode and keep using the phone as a GPS with no battery impact from poor reception.
I am being devil's advocate to an extent here, because I do think you have a point – there are some advantages to using a dedicated GPS in some circumstances. But there are a lot of common misconceptions about using a smartphone as a GPS too, and most objections can be easily overcome these days. A smartphone is far more versatile than most dedicated GPS units and just as reliable.