A whole kilometer out is a pretty long range. To me, it seems like if you're seeing a tank at more than a kilometer out, you and the tank both are most likely in pretty open areas. This is fine, so long as your enemy doesn't have air and artillery superiority. In this context you kind of narrow down the situations where it is actually useful to only situations where the tanks are stuck in an open area and you're in some location where the enemy isn't willing to just level the entire grid square. I think also as small combat drones start to become more commonplace, the use of weapons like the javelin is going to increasingly become more suicidal since it's a lot easier to figure out where they have been fired from VS traditional direct fire AT weapons.