A couple of other observations:
First, while ATGMs do have a much longer effective range than AT guns, local terrain will likely greatly limit advantage, unless you flatten and clear everything within 3,000 meters.
(OTOH, the ambush factor of an ATGM that finds a commanding view firing at very long range is significant.)
Secondly, AT guns have a useful role against attacking infantry, firing HE or some type of multiple-projectile round.
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