What the OP is saying is that dedicated healbots that can do nothing else are not needed.Quite frankly I have never thought it was a good idea to be a dedicate ANYTHING. Having at least some versatility in a character helps the to cover party holes when they occur and makes things more interesting for the player. Doing the same thing over and over again gets old quickly.
I covered this in the forge article a while back. No character should be purely dedicated to one aspect. However if that dedication is damage than you can still have variety even there.