Last FNF at Vancouver (on expert), I was about to depart and all 5 ATC stations were active. When I was first at the hold short line after quite a long queue for takeoff, before I even switched to tower frequency someone came behind, taxied quickly through me, and asked for takeoff clearance while entering the runway.
I nodded to myself in pity and expected him to disappear to Ghostland soon.
Instead, he got his clearance and took off.
If I remember correctly, the same controller was operating both ground and tower at that time, which was one of the busiest peaks in that event.
Obviously, it’s insane to expect one person to control takeoffs and landings on 3 active runways at the same time, taking care of ground movements including runway crossing and still notice those who try to get away will little ghostable games. Actually, even if there were separate controllers at that time, I doubt that they could still notice everything that going down on the ground when it’s so busy.
So I remembered that sometime I saw 2 approach frequencies at the same time, to split the workload. I wonder if similar thing exist for tower or ground. I think there are times it’s definitely needed.