Why can’t you hide web part on a wiki page?

I saw this post on the MSDN where the user can’t hide the web part when he adds it on a wiki page. I thought he might done something wrong.. so I tried the same thing, and yes, you can’t hide the web part on a wiki page, then I tried to hide the web part on a web part page, and yes, it’s hidden, so what’s the problem here?

The point is that you can’t hide web parts unless you turn on the publishing feature, so when you turn on the publishing feature on the site collection, hiding web parts on any page will be possible.!