They have already stated the rof for the bolter will likely be around 240 rpm so having it hit hard isn't really unreasonable. The bolter in space marine could use a buff, the damage was pitiful without kraken bolts, you shouldn't need a perk to make a gun competitive with those that don't need a perk. Most of the time you were better off using a dev and run and gunning with the heavy bolter then actually using the bolter designed for the job.
You make it sound as though any request for adherence to lore is just god awful. This is one of the areas where it can actually be accomplished, that boom flash and splat. It's entirely within reason and I would like it as well. This is a shooting MMO. The sounds and feel of the different weapons is hugely important.
That's only ever a thing in the lore when they need to speed up a scene or highlight raw carnage. Once they get down to the nitty gritty even Eldar can take one of those things and fight for a couple seconds. If someone tells you that bolters get the job done first time everytime, then they don't know why the Imperium needed bolters in the first place.
