I do the same thing
I don't think it's as dangerous as cutting but it can still be detrimental
--------Sorry I got detailed, trigger warning ------------
If you scratch through the skin, you will still have scars you want to hide. I also can't imagine cutting but I know that at times my scratching has progressed. You can do a lot of damage with your fingernails and sometimes I've gathered some tools. My nails are weak and sometimes I can't get enough scratch from them so I find something else. I also pick at my fingers and sometimes grab tweezers if there's a bit I can't get.
I just wanted you to know you aren't alone