Hiding units?

[Alvendor]

I'd say there is a lot of hiding going on but it might not be obvious all the time. Look at a Top10 player game again and think from each persons perspective:
"What possible moves might the opponent have done that I can't see?"
"What can the opponent see, and what will he suspect I have done?"

You will see that if any player lack crucial vision from any part of the map they will move to improve that, without wasting wits. Runners are positioned with a balance between how easy they are to take out and how much of the map they can reveal. There will be positioning of the other units to optimize the placement of specials and often to hide it.

On Shark Food there is a big difference to your response if the opponent put his bombshell one step forward or one step backward, and he wants to hide that from you.
On Long nine it is crucial for the defending player to know if the attacker is massing wits top or bottom to be able to fight them off. Putting two units to cutoff sight at the bottom is common on this map.
Any scrambler game is basically a war on information.