We use 'sp' density & preference scaled fonts throughout our app. We've
noticed that this mechanism just doesn't seem to cut it on larger screen
devices.  The issue is the distance someone uses a phone app from their
eyeballs vs. the distance used for a tablet. In our admittedly unscientific
research, the distance is about doubled. This coupled with the fact that,
based on our support requests, not very many people know about the system
font scaling properties leads us to think we need to find a better way to
solve the problem.

Since this isn't really a 'density' issue and is more tied to the physical
size of the device and, thus, the distance the device is held at, I'm
wonder what the best systematic approach is to handling font sizes on
physically larger screens? I'm willing to investigate some different
mechanisms just looking for suggestions on what other people have found
successful.