No drawbacks that I know of only pain. Why are you not willing to try and pinch up some skin so you can inject in the dead space you just created?
I don’t know if I am different than others but I can pull up a wad of skin from my love handle and lightly drag the needle across the skin and find spots I feel nothing. When I hit such a spot I just slowly push the needle in. 0 pain, no lumps, no PIP. I even blast this way injecting .65 ml(130mg) 3 times a week and it is great.