I think most places keep a brush in the toilet in a fancy caddy. That's because the expectation is that everyone scrubs any skid marks before leaving.
I suspect that the plunger is to do with standard sewage pipe guage rather than just "shoddy" workmanship or whatever. That's why bidet spray is more or less mandatory in South East Asia, the sewage pipes just aren't wide enough to handle toilet paper.
oh man. This looks awesome. thanks!