Oh, well I'll give you an example then - world 7 we have an unofficial ally babydoll with 4600 hp I think? Shes died in one round rushing a flag at the front, or blocking the flag. Or been close to death and no-one close enough to cover for her. She usually is a great help at blocking or helping us rush if we decide to rush because in old worlds the major win tactic seems to be a flag rush. A lot of the onliners will end up dieing trying to defend this if they block (and save the fort) while the ones that sit in their towers get the boxes and exp.
Also another example, last battle where we started with 10 less attackers than they had defenders, one of our allies - adventurer with 3500 hp took the lead and if they made it to the flag we might have had the fort, I would have nominated him for the MVP. People with 6k+ hp in forts usually will get a box for the sheer amount of times they dodge with that much hp.
Those are just some examples from previous battles in world 7 where the max either side can get at a fort battle is in the 80s. World 2 doesn't seem to do much better or world 8 either. World 10 both sides still have the ability to max out forts but I think almost everyone would be happy to have someone nominate them for the MVP of a fort, it doesn't mean you're the best fighter ever, just that the alliance appreciated what you did in that battle and they think you deserve this reward.
Those are the only worlds I play on so I can't judge every world, but I think in those worlds (and by extrapolation, all worlds) this addition would be a great improvement.
Also there have only been 1 or 2 battles that I have ever been to that I would consider nominating an offline player because of great positioning or something that the offline player did that results in us winning (one offliner with 6k hp put their character on the flag and it saved us the fort).