Cleaning staff

After watching the YR more times than I want to admit (it's been a great emotional diversion), I have come to the conclusion that every scene and every piece of dialogue does what it is supposed to do: move the plot or character forward. And for the most part, all of them do... except the cleaning staff. Is there some meaning to the cleaning staff that are often depicted in the show that a Canadian such as myself is unable to appreciate? They seem on par with the royal staff who are part of Wille's life but not part of Wille's life at the same time. Is this the same with the cleaning staff? And if so, what meaning they have to the plot or the character?

https://preview.redd.it/3f447l85i7de1.jpg?width=4000&format=pjpg&auto=webp&s=d8afe7d57c1335e05db96001b1a0824ba8e1fafa