Worrying about some exploitable gameplay mechanics/elements in this game

So I came across this video from Slorgs the other day and I rewatched a certain part of the video a few times thinking about games in general when certain "metas" have been established and a few things really made me worry

The segment from minute 12:40 to 14:50

youtu.be/1AhJHxUP5ts?t=760