Dermarolling..microneedling…synonyms for the same procedure. Does it really work?

I have seen so much hype on skin care boards and on YouTube that dermarolling works to smooth out acne scars, lift sagging skin and soften wrinkles. I have yet to see any concrete evidence it does indeed work to accomplish all these skin improvement goals. No before and after photos are offered.

I do not like to call anyone a liar, but would like to know the truth.