Document expert mode about docs HOT 3 CLOSED

I might be wrong, but I suspect expert mode is deliberately obscured (or, not readily documented) so that non-experts don't end up using it

from docs.

Yes, expert mode is is not documented for a reason. It was initially an option in the installer but too many people used that and ended up selecting unsupported options proving that they are no experts.
The outdated information from the M2 blog post should be redacted.

from docs.

This is undocumented by design. When it was documented and an actual prompt, too many people decided they were "experts" when they absolutely weren't, which led to a support nightmare.

I'm not sure why people keep reading year-old blog posts and thinking that is the state of things today. I have updated the blog post with a disclaimer at the top. You absolutely do not need expert mode to install on M2. That was only required for like the first month after the machines came out.

from docs.