Some users only have a mobile phone because they can't afford a laptop or a desktop. So they need to learn to do everything on the phone.

I use both but I use my laptop more, especially when writing posts and curating for the photo community. Photos show differently and you can't really see quality on the phone. This is a problem in case of those who only use their phones as most of the times they don't see the photos are not the quality they are hoping for.

As about navigating, it's more difficult on mobile, or should I say shower. Charting on a phone is a pain though, LTF is ok but if you want the big picture, you need a proper screen,
or two.