I don't think 1 is correct for all, as I never asked for permission. However I say prior to invite someone that a friend will come (which is I think common politeness). For 2 I think she is picky and not representative of everyone. For 3, I have to say that I hate having the washroom wet when I go to the public toilet, but is it only me who like clean toilets? For 4 I think we all have the same problem when we have a particular place for a tool.

I think something is however important with Japanese people we don't have in the West, it is to planify well everything 1 month before.