I say so otherwise. Shingen is the other most broken hero.
Short term: Not really.
Long term: Ehhhhh not really.
End game: Yes. As irritating as it is for me to say this since I personally hate Ea, objectively speaking Ea is one of the few units that lets you break dmg cap when your grid is fully decked out. On AW her burst lets her do an additional strike (we call this echo burst) with a burst multiplier of 200%. It's useful when your team can hit burst dmg cap which is actually pretty easy later on for average players with completed grids. And even if you can't hit the cap but are still doing very high dmg anyway, it's an extra hit that still does handsome dmg. So yea, if you do plan to dedicate yourself into end game, just keep her around. But don't hurry on AWing her yet until you've reach that point.