From Kehilat Hadar’s website. It reminds me a lot of various discussions I’ve had about what people are or aren’t going to understand (see page 74, “What if they don’t know the play’s over?”) I also enjoy the prohibition against stage directions.

Why don’t you announce page numbers or when to sit/stand?
We encourage people to daven at their own pace, and recognize that not everyone shares the same custom of when to sit or stand. We also believe that interjections such as page numbers and stage directions harm the natural flow and rhythm of the service. In addition, there are large portions of the service where it is halachically forbidden to interrupt. Therefore, we do not announce pages or tell people when to sit/stand.

However, we realize that not everyone knows where the congregation is at any particular point in the service. We have therefore provided a sheet with page numbers for the most commonly used siddurim. We also encourage people to ask their neighbor for help if they want to find out where the congregation is.

(Seems like this is going to be the year of more Judaism. I just created a category for it.)