Yes, yes it does.
Not an automatic shotcaller, but an automatic leader by default applies to every single Main Tank in the game as it is LITERALLY their job.
An Off-Tank can not claim space, they can enforce the protection of space already taken- but they can not claim space.
A DPS/Support can not claim space, they will easily be picked off as they have no reliable protection.
A Main Tank can claim space, they control the battlefield in terms of which team has more ground. Who’s holding where, etc,. They can not keep that space, and as such, require a lot of healing and the damage to back it up.
Perfect example of this: Dive
Another example of this: GOATs
In Dive, Winston and D.Va will jump in and maybe get 1 pick on their own. With Discord Orb (help from a Support), they might get 2. When Genji, Tracer, or Sombra go in with them- they now have the damage to get more kills- whereas previously they did not.
In diving onto the enemy supports, the Dive Tanks have claimed space- that gives the DPS windows of opportunity to move in.
In GOATs, DPS are unnecessary because the Tanks receive such high amounts of healing and mobility (their 2 greatest weaknesses), that they can rush in and end a fight before the enemy team can react.
There are multiple counter-comps to GOATs, but you can’t run them out of spawn because you don’t know for certain that the enemy is running GOATs until after the first primary fight.
See how this works?
Main Tanks = Automatic leader