I would also like to mention that often tanks don't have enough health to stall for very long against targets that need to be stalled for a long time.
This is my solution I would love to see implement in KR4 4 -- tanks can engage with three units. The basic idea is that while a damagy hero can kill say, two enemies a certain amount of time, the tank can stall three until they are killed by a tower. I think this will give the hero a bigger impact, they might not be able to kill an enemy but they can stall a decent size portion of the attacking force. The hero would also be attacking all three enemies at the same time.
To make the tank not die fast, they would require a hp boost.
I do think Catha is good example of this. She can summon four pixies that can delay for enemies for quite some time, and because of her good damage and ability to heal them up to increase the delay time.
I want to make it clear who I think is a tank, and could get this capabilities if they were in KR4:
-Gerald Lightseeker
-Malik Hammerfury
-Ignvar Bearclaw
-Hacksaw
-Thor
-Cronan (he can already attack three enemies at once, but his boars have low health and damage, so I would say it is bad implementation of the concept)
-GRAWL
-Karkinos
-Razz and Rags
-Prince Denas
-Xin
-Durax
-Bravebark
Feedback is always appreciated.
