One, your point about not being much different from the level of Army group and HQ's and what not is well taken, But remember the devs have already confirmed that commanders at most levels are optional. Not every division or corps will require them.
Right - and there's no reason every air zone/region should require them, either. They could represent optional bonuses, not mandatory allocations.
Second, the Battle of Britain is over romanticized. "Oh noes, air superiority over the channel would have meant that the Brits couldn't put the Royal navy there."
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We're just going to have to agree to disagree, here, I think. Could-be's and might-have-beens can be debated for ever; we'll never really know just what the outcome of a Luftwaffe victory would have been, but the potential knock-on effects (i.e. the RN might block an invasion but lose the ability to control another of the three key naval theatres, causing the loss of Suez, Gibraltar and Africa and severing communications with India) or direct effects would have been critically serious to the UK. Maybe they would even have forced a settlement with Hitler. Maybe they would also have forced Hitler to delay Barbarossa - who knows?
I fixed your quote there.
Niiiice fix! On that one, at least, we agree.
I would expect this, but it should be quite a huge reduction like 90%. Yes you need to build new engines, or wings, etc... but you also recycle and melt down all the old pieces that your removing. Really the only thing that it should take is time.
If old kit is to be recycled for anything, it should be experience of new units/production time for new units/manpower rate, it seems to me. The most common use for old gear was for training (after second-line units had had their go).