The heck with WWI GVs! Where's my zeppelin????? Warbird's Dawn of Aces not only had zeps, it also had the ability to call in arty strikes from zeps and two-seat aircraft. Click on the map, call in a spotting round, adjust aim, call in another spotting round; once on target, call in "fire for effect" barrage. Way cool.
And regarding tanks, my son plays Battlefield I, and the GVs seem quite popular. Yes, I know it's arcade-ish, and the game play is completely different. I'm just saying, there are ways to add them that could make them effective. After all, AH takes plenty of license when it comes to such things as mechanical reliability and magic spawn points.