the truth is one day people who have gotten transplants will regret they did. we don't know 100% why we lose our hair, or how to prevent it... so the best thing we have come up with is to just replace the hair follicles that aren't working with ones that are. essentially losing density in the back/sides, and butchering existing follicles with the transplanted hair follicles. in a perfect world we would all love to keep our hair follicles in their natural locations, and not have a surgeon rearrange them to keep us from looking bald.
thus a hair transplant is a last resort in my book, if you can avoid it, i def would... on the other hand if you need it, i'd do it and stop waiting for us to figure out hair loss. the clock keeps ticking, and having a full head of hair in your prime is essential.