I rarely use Ash nowadays because I find his blade storm hard to use in a squad. My team mates would always kill my marked targets first before I can fire it off. Back in the old days of Warframe, we just need to press his Ult button and off he goes killing every one in the room. I know it was a broken ability of his but what if we put a different restriction other than marking enemies. We can probably just make his blade storm a line of sight or put a limit to 5 to 10 enemies he would strike. heck, I'll even take a cooldown on it just to avoid the spam of it.
Please consider changing the current blade storm. I just don't find it fun to use it