It does seem like high resolution would make a big difference. If you look at pictures of tanks that are pretty fully covered with reactive armor, there are st

It does seem like high resolution would make a big difference. If you look at pictures of tanks that are pretty fully covered with reactive armor, there are still lots of gaps of varying sizes for things like hatches, view ports, exhaust, between reactive armor modules, and so on. So a high res focal plane could direct the weapon into one of many sweet spots.