Disappointing? Sorry to read I've disappointed you, dear internet user. I've administered a lot of systems over the years, and they often contain tools I don't really know and didn't install. It's always much easier to look for things in the usual places, like logs in /var/log, instead of having to figure out where each random application decided dump its stuff.

I'm quite fond of the path of least surprises.

Splitting an installation across multiple locations has additional benefits. It's a good thing that the application user can't modify the binaries (which is pretty much enforced when the binaries live in /usr). You can achieve the same thing when dumping everything in /opt/$foo, but that's pretty much the worst of both worlds imo.