Grammar, not just vocabulary
Unlike a list of polite substitute words, this system is built directly into verb conjugation and sentence structure, and a single sentence can layer the subject, object, and listener axes of honorifics simultaneously. That's part of why it takes deliberate study to internalize, even for people who've picked up plenty of individual polite phrases already.
Why the over-honorification mistake is so widespread
Extending customer-service politeness habits to inanimate things — a price, a drink, an order — has become common in service settings, which is exactly why language authorities specifically call it out as a standard-language error rather than a harmless quirk. Recognizing the pattern makes it much easier to notice, and avoid, in your own speech.
Frequently Asked Questions
What's the difference between subject and object honorifics?
Subject honorifics raise the person doing the action, marked with -si- on the verb, while object honorifics raise the person receiving the action or referred to by an indirect object, usually through a dedicated honorific verb rather than a verb ending.
Why is "the coffee you ordered has arrived," honorific-style, considered wrong?
Because -si- is meant to honor a person, and in that sentence it's attached to a verb whose grammatical subject is an inanimate object — the coffee — rather than a person, so the standard-language correct form simply drops the -si-.