@monotone_ink to me it's just a case where I think you're used to doing traditional more than working fully digital. I'm the same way- when I ink traditionally my lines are more solid and I can get really fine/sharp points that I like. With digital, I'm still struggling with control, where all my lines dont come out exactly the way I would like- but right now digital is saving me a ton of time, process, & money on art supplies.
In time your digital work will get to the level that you like, you just gotta be patient & persistent with it.