because nobody grinds them for marks, right? there's no way public events maybe spawning once a minute for 3 marks is any faster than the strike guaranteeing you 6 for 20 minutes work. and yeah, the low level enemies don't have the higher drop rate, they aren't part of the strike, so can be ignored.. the one lot that I don't is usually the cabal halfway through the Mars strike when it dips between restricted zones, otherwise your just waiting time killing trash mobs that you could farm all you like in patrol, as opposed to finishing the strike and getting the drops / marks / finishing the bounties