I just discovered something. If I press and hold an app and go App info > Notifications > Lockscreen there are different options to choose from like show all notification content or show sensitive content only when unlocked or don't show at all. I knew this could be changed system wide by going to Settings > Notifications > Notifications on Lockscreen but does doing this by going to App Info set this per app instead of system wide? If so this is pretty sweet! I'll be playing around with this now.