Second, it's much more straightforward vs any tags (and remembering having to close them without any help in your plain text editor)
And is also much more discoverable in the intuitive interface with the full list of available styles right there with styled buttons so you don't need to think whether <u> is underline, underscore, or something else entirely.
That's the whole point of why this can't ever be for "everyone" - it requires too much knowledge that's not generally useful.
But yeah, with such a trivialization of the effort required, you'll never understand why people shouldn't be exposed to markup.
> It's cool someone tries to make it reachable to more people.
Not unless he misleads them