Ds and brand new part skill checks

Ok I have about 1.5k hours in this game and I will be the first one to admit…. I suck at skill checks. I’m good at chase good at saves but timing a damn skill check absolutely not. I have a question for everybody though. For brand new part and ds why does the skill check even exist. It makes no sense to me why a perk you are bringing into the game to help you with getting tunneled is dependent on you hitting a difficult skill check. I brought the perk it should be free. I get brand new part somewhat since that’s an item but ds should be free imo. I saw the old ds and everybody was flipping out because the meter was giant like shouldn’t that be the point… a giant ass meter so you hit it everytime. It just doesn’t make any sense to me. And yes I know I know “skill issue” but I don’t use the perk for that reason, friends of mine do and they’ll miss it occasionally and I think to myself “well that was a waste”