[narwan]

All units? Well for MBT's that lack HE rounds HEAT rounds were supposed to fill the double role against both soft and hard targets. So I don't see a problem there.

Specialist ATGM units either have low ammo (like ATGM teams) that will make it unlikely they'll waste many rounds if any against soft targets. And you have the filter option to let these fire at hard targets which is their job. As these usually do very badly against soft targets there's little reason to want these to shot at soft targets so there doesn't seem to be a big problem there either.

That leaves multipurpose units like squads who can expect to fight both armor and soft targets. They will fire what they have and keep the last four HEAT rounds for use against armor. Seems very sensible to me. The AT weapons they have like LAW's, RPG's etc are not just antiarmor weapons. They are a squads ability to project some heavy blasting firepower against any target that needs it. That could be the wall the enemy squad 100m away is hiding behind (which in game terms means simply you'll fire a HEAT round at the target). It could be the MG position on the upper floor of a building where you can't get a riflegrenade or handgrenade in. There are countless examples you can come up with where a squad would use a HEAT weapon against another soft unit BECAUSE it is the right weapon to use.
Then there's off course the fact that commanders tend to use all means available to take out the enemy (think using hellfire's to hunt for snipers as we saw in recent conflicts). I'm not sure not all commanders would in reality reserve the last 4 rounds fro anti-armor use that may never occur.

The game mimics all that by firing HEAT against soft targets. You may not get a message that the enemy is hiding behind a wall a needs to be blasted but that's what's happening.

This is only an issue btw in the AI's turn as in your own you can simply turn the weapon off before firing.
But I don't think it's unrealistic, on the contrary.

Narwan