I'm not sure that the Grid frames can become that huge.
But they're easily legible, and can be configured in a lot of ways.
And forced to display alphabetical or specific toons, classes etc.

And you can configure more then option, and easily switch between the options on the fly.
Or decide on option A in this situation and option B in this other one.
Choice are Solo, Group, 10-man, 25-man, 40-man.
With the configuration of choice for each.