Yeah, I've heard the argument against bloom. My stance has always been that bloom gives you the choice to play as you want, and deal with the consequences. Using the weapons for their INTENDED ROLE within the sandbox, delivers ZERO variability. Taking the weapons OUT of their role, leads to reduced accuracy and variability.
Let's take the DMR. You have a choice: You can choose to line up your shots with the bloom, delivering 100% accuracy at a reduced rate of fire. The ROF that delivers perfect accuracy decreases at distance, preventing the weapon from being as effective at range as it is at mid-range, while keeping it useful for perstering and anti-sniper defense.
At short-range, you have taken the DMR OUT of it's intended role within the sandbox. You are using a mid-range weapon in a short-range conflict. As such, you have the choice to keep timing your shots to the bloom, delivering less damage per second than the short-range weapons you might be up against. Or, you can choose to hammer the trigger, and increase your potential DPS, but decrease your accuracy and introduce chance into the equation.
The choice is yours. Use the weapons properly, in the roles they are intended, and adjust your tactics to fit the weapons you are carrying, and you'll never miss a shot because of bloom. Stretch the bounds of the weapon's functionality, and you are rolling the dice. This is how all weapons work, and it ensures that some weapons (pistol, BR, etc) do not dominate across all encounters.
