I too figured out all sorts of computer things at 12. By standardized tests, I'm also in the top 1% of ability for things like that. And my dad was a programmer then, so I had a leg up.
At some point, I realized I had a choice. I could feel smug about my (narrow) genius and focus on tools for my (narrow) cohort. While grumping, of course, about how stupid everybody else was. Or I could recognize my luck and use it to make things that were good for everybody.
You know what helped me make this choice? Realizing how bad I was at so many other things. And how generous other people were in not only putting up with that, but helping me along.
Our school had nothing blocked, and the computers weren't locked down at all.
But Slack isn't solely used by technical people. Where I work, everyone is on slack - product people, lawyers, tech people, etc.
Who the hell cares? I figured out IRC when I was about 12 and I'm no genius. If that bar is too high for people in tech then we have serious problems.