What you're saying would make sense if our primary goal was to provide an administration plugin. It's not. We're not trying to clone Mani or provide a Mani clone.
SourceMod is a scripting engine and platform. The user-mode, in-game administration features are sugar-coating. They are provided for learning purposes and to give something administrators to start off with. What you think are "basic and core" features are not actually basic and core features to the platform, and while SourceMod is beta and targeted toward developers, that continues to be our highest priority.
That doesn't mean those features won't be added, aren't being worked on, or won't show up for a final release. What it does mean is that your priorities as a game server owner aren't always the same as our priorities of providing developers with the tools they need.