It's been discussed a NUMBER of times, actually. Consensus is that it's totally unneeded and would be much more inaccurate than our number-readout-system we have now.
In reality, in WW2, it was useful because German pilots would have a rough idea of how much ammo they had left. In Aces High, where you can fly multiple combats in a single sortie, engage and disengage a dozen times, rearm on a hotpad, and keep going, you really need a better understanding of where you stand so you can decide when to turn back and when to keep going.
In WW2 you'd have combat then RTB. Your first combat was usually the last of the day (most times). The majority of pilots in all nations would fire their guns until they ran out then run away. The US pilots were notorious for that, too.
As for using the LW ammo counters for trim? I think it's a clever use of the historical cockpit layout to convey information. I can see how some might not appreciate it, however I don't think it's really worth it to shoe-horn them in somewhere else so that the analog and inaccurate ammo counters on just a few planes can be implemented.
P.S. Trim is not just "to make it easy" -- it's because of the differences with a real stick in a real plane with real forces on it vs a spring-centered joystick at a computer. Reality vs implementation. It's there to help mimic reality with the hardware we have. In the real case, you could just shift your "center" with a little more pressure and fly normally. In this game, your "center" is fixed because of the sensors/pots on your stick and the spring-to-center yields wildly out-of-trim situations that should be easier to overcome than we really can. That's how trim works in this game -- it's not "trim" trim it's just allowing you to shift your stick's "center." That's how we can have aileron trim in planes that didn't have adjustable aileron trim. It's not modelling the trim, but modelling you just holding the stick a fraction of an inch "to the left" instead. You'll see that the control surfaces actually deflect too.
Okay. Ammo counter discussion.
1. Number of sorties is irrelevant to the function of the ammo counter, but just so you know it was common for the Germans to fly multiple sorties in a single day. Read any number of Luftwaffe journals. It comes down to location and mission and most of the war they were fighting over there own airfields. I'm noticing a trend in the counter argument to having everything compared to the Americans, why? Read more folks.
2. The function of the ammo counter is not wildly inaccurate. In the photo above, for game arguments sake, you have left to right MG 17(left), MG151, MG 17(right). It is pretty clearly displaying you have ~250rds each MG 17, and ~180rds of the cannon. Now real life, sure, hampered by electro-mechanical systems of the time, it would could be off a little, but you would be splitting hairs over 10-15 rds, in either case, you are RTB. In the game, yes I realize its a game, fed by on-the-gnats-ass digital numbers, it would display just as accurate real time information on your ammo count. Don't have white bars, go home. You would have a counter for each gun in your aircraft.
3. As far as cramming the beloved trim indicators elsewhere.. Why not? It is blended into the P-51, P-38 and many others nicely without disturbing the historical layout.
It really boils down to cosmetics/marketing. I stayed away from Aces High for a long time when it was AH2 over this issue really. I looked at the cockpit pictures and thought "ew, doesn't seem like these guys bother with research". How many others thought the same with
every competitor game/sim getting this detail right? I like what AH3 offers to make it competitive again. I like that it is actively being looked at and issues responded to, something not being done in my previous corner of the internet, but it can still be improved in little areas to appeal to more people.
BTW I do realize this is a bottom of the totem pole item for Hitech. Hence future wishlist.