I don't think anyone really wants less features in the game, that is clearly a hyperbole for dramatic effect. My question to you is would you rather have air supply so you can properly lose the battle of Stalingrad(or win the battle of Bastogne), or would you rather have a more capable AI or a better main supply system. Paradox doesn't have infinite time and resources, it seems like that gets overlooked. WWII is one of the largest and most well documented wars, with new and complex technology and strategies that are being represented. There will be sacrifices and in my opinion the cost vs reward of adding this should not make the cut.
Air supply happened in WWII. Paradox can't do everything. When you compare the time to develop this and the impact on the game, I think Paradox made the right choice.