A. Final Fantasy games have always given us an airship once we progress enough to bypass tons of things and get where we need to quicker. That is what flight is in this game.
C. If you make ARR hunts cater to the newest expansion then those that cannot get the expansion and those not lv70 with optimal gear will be left out. The best way to fix the current issue with outdated hunts is to have people sync down to that level.