@OutdoorMan I also find the existing limit of 3 data screens limiting, and there is absolutely no good reason why this limit exists. Keep in mind that older users with declining eyesight want fewer larger font fields per screen. I try to not exceed 4 fields per screen, and if I want to use a graph data field, that limits that screen to two fields.
For example, on the main screen I have elapsed time, distance, HR, average pace. Then I always have a screen dedicated to vertical stats - current elevation, ascent, descent, vertical speed. That leaves me with only one data screen for everything else, and I have to think hard what I have there. Also, I like to have a screen focused on the current performance including pace, HR, cadence, etc. But then I also want fields like the battery level, sunset/sunrise time, etc. Also that leaves me no way to use any lap specific fields, which are sometimes useful when racing. I end up using some S+ apps as a workaround to have additional fields. But that is a rather poor workaround.