Though I've never heard of there being a stigma for treating low T, I agree that there shouldn't be. But that's not the point. Dwayne Johnson isn't taking anabolics to treat low T levels. You've built a straw-man by conflating the uses. Steroid abuse can cause long term damage.
There's no stigma for treating clinically low T. But as with most things in life, there's a spectrum. And strength / resistance exercise / ability to build & retain muscle will be impaired way before you hit the clinical threshold. There's a fairly solid correlation across the normal range.
Having said that, if there's no medical reason, what we're really talking about is people taking medication that they'd be, on balance, physically healthier without, in order to better fit in with society's expectations (endurance exercise, triathlons and so on, is associated with good long-term health outcomes, being jacked is not). And while I don't think artificially boosting T within the normal range is necessarily any worse for your body than, say, being on hormonal birth control long-term is for women, it's still pretty messed up that people feel like they have to.
