Subtle. But I think your first sentence is more telling than the second. Shortsightedness isn't just a physical impairment.
Any class, or character, can claim they are in charge. And any character can have a skill or ability that messes up someone elses.
Be a barbarian and attack the wizard if he trys to cast a spell.
The barbarian can run into a group of enemies that the wizard wanted to fireball.
A monk could stun something and say "hit it while you have advantage", and the rest of the party could go off in a different direction.
A bard could cast hypnotic pattern, and the paladin could refuse to attack because it would be dishonorable.
An illusionist could setup an illusion, only to have the barbarian run right though it.
A rogue could want to sneak up and scout and sir clank-a-lot could spoil it for him.
The fighter could knock someone prone for the rogue, who runs away.
etc...
What does any of that have to do with a warlord class?
And the second sentence was about my limited experience. Not an attack. I have only played with more mature players. I have not played with less mature ones. I havn't seen anyone do that kind of thing.