I suppose the violence is tied up to the fact that it really was just an excuse to show things that really didn't matter. It went from being the final evolution of Shinji's character and his decision regarding Instrumentality to painfully spelling out what happened during the events of the last two episodes.
Although, maybe it was needed, because apparently people still believe that the in the TV series,Which is just insane to me, but anime (fans).Shinji accepts Instrumentality.
My understanding is that the common interpretation of the OG series is that Shinji does indeed accept Instrumentality.