In my understanding, a HEAT round would be effectively "ruined" by having to pass through a significant amount (anything a tank might consider "cover") of earth, sandbags, stone, etc before impacting on the intended armoured target.
A pure AP round on the other hand might be able to cut through the obstacle relatively well.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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