> there is a reason you're using hacker news and probably reddit

It's a good place to talk stuff that's popular, but discussions fade and die quickly.

Also, I still use vBulletin-like forums.

Examples from the last decade I still use: mbworld.org for discussing Mercedes cars, bitcointalk, hwupgrade, overclockers.uk and some others.

Reddit/Twitter absolutely cannot replace any of those I listed for long lasting specific discussions, they are just unfit.