Exporting a drawing to a bitmap format will use the screen resoltion without
asking the user. This is wrong both when the target is paper printing or when
the target is web document.

In the first case required dpi is usually standardised higher than the screen dpi.
In the second case it's usually standardised lower.

In any way using the screen dpi (which can be pretty much anything depending on
the hardware) when producing image documents (which will be reused on other
different hardware) is plain wrong