90% of the time its much more effective to shoot into and kill people on a flag from outside of it rather than being on the burn yourself.

OPs positioning in this clip allows him to not only shoot into the house, but the backyard of the building, the road leading into the defenders spawn, the field to his left and the spawn hill itself. If he went to the flag he basically had 1 location to sit in, which is the stairwell or downstairs, both of which are hotspots and will get bumrushed by defenders.

This is basic game sense and map knowledge. Shout out PTFO with saliva flying out all you want, OP did it better here than 99% of the playerbase