I'll add to the 'new generation' thoughts by adding that gossip spreads to other people letting them know this game is 'hard to bomb'.
Back when I flew Warbirds, a guy who played AH and did manual calibration gave me his impression of bombing in AH. He flew both sims and said the AH method was very complicated and you were 'barely lucky' to hit a target. Well, guess what, after practice (which requires actual effort for those new generations) I am able to manually bomb targets with good success. The only difference is setting up your flight, speed etc.
Warbirds is a point and click bombing method, a 6th grade skill level much much easier than to AH autocalibration, where you just get into bombadier mode and it will laser sight line up your target and you can jockey the throttle around, do impossible flips, then pull throttle back to idle, glide, and still hit all your tiny targets. Wow.
Stepping into AH, there's a pre planning concept that one must adopt to be successful, once you accept pre planning, you are successful in AH's Auto calibration and manual calibration. Now I find both easy! It's just about pre planning. Ok, you may not be able to hit as many targets in a single pass, but it is easy to aim and drop. Just requires more bombers to achieve victory in killing all FH/BH/VH/s.... That's the decision point on how fast or easy you want someone to win the war.
That should be the selling point anyone tells you that manual calibration is too hard, tell them it gets easy once you practice planning the approach. Offer them help to see the light. Also tell them FSO and Saturday events are the premium, and consider the AvA arena a good place to practice for these events.