A weapon hardly anyone is going to get has zero effect on anyone's effort to grind out a12 or their relic, that's like saying my efforts for grinding mgp are worthless because catpot exists. if you want the best weapon you can get get your relic or do a12 the time you spend trying to grind for the 280 is pretty much wasted given that you'll be able to buy a better weapon for 20k in 3 months.