Hair transplants, should I save some body hair?

So I am young but preparing for the future, in case when (if?) I get older and start to have thinning hair and want to get a hair transplant, should I not permanently remove some of my body hair? There is this home device called me by elos but uses radio waves and pulsed light to permanently remove hair and I’m not sure if I should remove it all like I want to or keep a bit to be transplanted on my head one day. What should I do?