Many, many guys were blasting and cruising and after years they did conceive. Do you know many that after gear use lost permanently their ability to make kids? Because I don’t, and honestly don’t remember seeing many cases online. Guys that weren’t able to conceive were probably the ones who stopped gear and just tried to do it without blasting HMG, or LH, FSH and what not.
Last one somewhat popular I remember with great success conceiving is chase irons. He was blasting and cruising for 14 years straight without taking any HCG, his sperm count when he decided to make kids was 0, like legit zero. After a course of fertility drugs his numbers went up (not crazy high though) in just some months and he successfully conceived.
Just a sneak peak to all old meatheads who run gear without even doing pct or something and you’ll see most of them are have families.
TLDR, does HCG help maintaining some level of fertility? Yes. Is it necessary to run if you want to conceive in future? No.