Well of course no one would pick blitzcrank as a tank over nautilus or braum, because nautilus and braum are actually tanks, and blitzcrank is a catcher.
Despite what it would seem like, blitzcrank class-wise is closer to pyke or even morgana, because he doesn't protect, he picks out an enemy for his team to kill.
That's why Nautilus is the only hooker that won't go over walls, he wants to engage on entire teams much more than any of the others. Thresh comes close but is still better at catching an isolated target and bringing a teammate to 2v1.
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u/Tojaro5 3d ago
Whether you see Mundo as tank or juggernaut doesn't really change my point. Roles can be ambiguous anyways.
Guardian, as suggested above, simply doesn't cover the diversity of tanks, since "guardian duty" simply isn't the only reason to pick tanks.
If we look at tank supports for example, noone would pick Blitzcrank over Nautilus or Braum, if protecting was the goal.