I’ve previously posted about the history of antiarmor weapons and the current state-of-the-art. The takeaway: tanks have never been invulnerable, and they don’t need to be. Also, Anti-Tank Guided Missiles have become and are becoming longer-ranged, more accurate, and more lethal. Despite improvements in ATGM technology over first-generation weapons like the AT-3 Sagger, American tactics have remained essentially unchanged for decades, although armor protection has improved.
The ATGM threat profile is a combination of standoff and high kill probability (per launch). Remember, these don’t have to make ATGMs completely worthless, just make them less useful. I’ll look at standoff first.