Good points - so let me clarify my statements. "Just a Navigation" tool is not my intended interpretation. Our focus is navigation, and our features tend to derive from this. Navigation requires a flight plan. And planning is easier with overlaid weather info. Not to mention fuel prices, airport details, etc. Real Plan makes this even easier. And it's convenient to file a plan without exporting/importing to some other app or manually typing into another service. And in flight navigation is improved with terrain awareness, synthetic vision, HITS, customizable instruments, airspace alerts, etc, etc, etc. And we have other convience tools like sketches, real-view, timers, etc. But these are all related to navigation/plannign/moving map sorts of stuff.
So I'm not saying W&B is off the list - but it would be more of a tertiary tool than most of our features. And there are lots of free apps that do a good job, so including it wouldn't gain as much.
CheckLists, otoh, add an obvious convenience - while in flight you typically don't want to exit your navigation app and launch another app. Also the nav tool knows the selected aircraft and flight phase, so popping the list can be automated. So I can see this being included before W&B.