Smirfy, in your last post you are just complaining about the turn based system and IGO UGO mechanics, not the supply system.
Yes, it is inherent to turn based system, and especially IGO UGO, that a unit will move "hundered of miles" and do many things while the opponent is unable to react. We knew WITE was going to be turn based and IGO UGO, like, YEARS in advance, and it's kinda beside the point to complain about it now.
As for the C&C complaints.... I do think most of them stem from the fact you're playing the AI, and using half a brain at that. Play a human opponent and see how EVERY little bit counts, and how HQ hieararchy makes or breaks a battle by sending reserves, supporting units etc.
Also, do you suggest a unit should starve just because it wasn't attached to a nearby HQ? I am sure there will be some food and fuel found for them even if they are currently unattached to anything near