Guild Wars 2

I just thought about on interesting thing.
Imagine a rpg game with dynamic combat, where roles are completely nonexistent.Of course there is dps and heal and control, but no roles.Everybody does everything.
And then let’s try to look at it from the casual spectator point of view.How can we describe fight 5v5?Well, only couple of words: “they are fighting. everybody does everything”.
But imagine a game, where there are a lot of roles(for example dota 2)
And there is fight 5v5.How can we describe it?Well, something like “Great initiation by xxx, yyy is ganked far away from his team, failed control attempt by zzz, and in the end it is a tradeoff of carry for 2 supports, that did not worth it.”
What i am trying to say is that lack of strictly defined roles is ruining the interest of a game for spectators, because there is nothing to watch on strategic level.
What do you think?
(all examples are exaggerated)