The stigma is real, because Tor is actually extremely slow (at least in India) for everyday use. Even when I want to visit sites that are blocked by Indian ISPs, and which do have an easily found .onion address, I don't bother with it - I'd rather use a free VPN instead, despite the lack of transparency involved - Tor is just too
slow.
Unless it (somehow) finds a way to decrease latency in the future, it will remain as it is today - filling a useful niche for the masses, and even a daily driver for the privacy concerned - but I can't see it ever being in the mainstream. The average users couldn't give two hoots about privacy - they just want things to work, which is an understandable PoV.
And why would anyone visit HN with it? FB, I can get behind, but what tangible benefits would you get from using Tor on a site which (afaik) doesn't track you, and doesn't sell your data? Genuinely curious.