Here's the idea. You can;'t encircle the enemy if he can escape into one of your territories. In HoI2, especially with motorised/mechanised/armoured division, you could leave most of your territories open, surround some infantry, and atatck him before they can take one of yours, then you kill them because 'they can't escape'.
I don't think this is realistic. The infantry would be able to escape into your territory when broken, they wouldn't just give up. At least not anymore than a broken enemy would when retreating into his own territory. It would force you to actually have them encircled.
Same thing for paratroopers. If they fail an airdrop into resisting territory, then they shouldn't be gone, they should retreat to an unoccupied territory, enemy or friendly, though they would take like 50% strength damage probably
I don't think this is realistic. The infantry would be able to escape into your territory when broken, they wouldn't just give up. At least not anymore than a broken enemy would when retreating into his own territory. It would force you to actually have them encircled.
Same thing for paratroopers. If they fail an airdrop into resisting territory, then they shouldn't be gone, they should retreat to an unoccupied territory, enemy or friendly, though they would take like 50% strength damage probably