Statement as an imperative

[seth.destructor]

I would like to explore the concept of using statements as the
imperatives. I am very often confused, when I am told f.e:
There is a box on the table.
and it means Could you put this box on the floor.
or
I don't have tea.
= Could you brew one for me?

Why is it so? I feel as if it were the way of avoiding any polite
request: Could you, would you, can you. There is some hidden
rudeness in such an enigmatic phrases. How do you regard it?

[Gość: Seth]

You are right about the rudeness, except that it is not hidden. "There is a box on the table", for example, has the clear meaning that it should be obvious to anyone with half a brain that it shouldn't be on the table, that you therefore shouldn't have put it or left it there and that you need to remove it now." It is direct criticism without any opening for explanation.

The boss (presumably) may be simply arrogant and rude, be having a bad day (in which case an apology might come later) or he/she is just simply fed up with things being continuously badly done (by you?).

[Gość: Steve]

Sorry, but I named myself Seth in the last message. It was really me.

[seth.destructor]

I guessed. You have an unique style of writing:)

I am going to force them to use the imperative mode. We'll see how
long they bear it.