I can definitely see the advantage of going upstairs. Can see so much more of a shape of a team etc. I know a lot of teams record training sessions and matches from a birds eye view exactly for this.
As a rugby league fan too this is the norm. You never see a head coach on the dug out until maybe the last 10 minutes if a game.
I can see the disadvtange of your lack of presence on sideline for the team and how this can impact them. Swings and roundabouts but I'd be upstairs first half