It’s all these little things that add up. I recall a locust swarm, became clear they wouldn’t snipe a planetary, Serral realised this super quickly and focused the sensor tower.
Sounds small, the amount of times I see players initially going for the plantetary, dilly dallying when they realise they can’t kill it, and ultimately end up doing nothing impactful.
Serral seems to crunch the numbers immediately and, if his plan A isn’t popular always picks the good plan B. So he can’t snipe a planetary but gets that sensor tower that ultimately gives him more room to manoeuvre around a position. There are too many units guarding against a runby he backs off, if he can’t get serious damage in a position he pulls backs and uses his lings to snipe a blocking supply depot if he can, which opens it up to future runbys if his opponent doesn’t plug the gap.