HF's don't die unless by burns or scarring alopecias. Androgenetic Alopecia is non-scarring.
Cotsarelis et al discovered long ago that HF bulge stem cells regenerate hair follicles during cycling and also contribute to epidermal regeneration in response to wounding. We don't need to dermaroll or dermapen to the depth of HF or anywhere close to the bulge. That would be like blowing up Willy's chocolate factory. Apparently we merely want to get the attention of the "Oopa Loompas" or stem cells to send in the recruits to repair skin damage. At that point the Oompa Loompas can be negotiated with to either make skin or chocolate(hair).
Can pulling out hairs kill the follicles? i used to have a nasty habit of pulling hair out my crown when i was anxious for some bizarre reason and it's my crown area that is worst hit. Don't know if i have caused permanent damage to some of them or something from a long time of doing that.