The OP isn't wrong, but it entirely depends on the makeup of the team. Take Ottawa for example, they would protect:
-Turris, Brassard, Stone, Ryan, Hoffman, Pageau, MacArthur/Lazar
-Karlsson, Phaneuf, Ceci/Methot
-Anderson
As it stands Ottawa is likely going to lose one of Methot or Ceci for nothing. But if they were to move one of them for a young top for 4D that is exempt, instead they lose one of MacArthur Lazar for nothing.
It would be much easier losing Mac or Lazar for nothing than Methot or Ceci.
Even if we traded one of them for picks and prospects, it would likely be better than anything we'd get for Mac and Lazar.