Every time I open the export box, it's quite small. The first thing I do is maximise it so I can properly see the pixel details when zoomed in. I do that every time, but I can see some people might more be interested in the file size.
* Can I recommend it have some way of automatically opening maximised, either by remembering the last state or having an option (or just always doing so). I think it would make sense for the dialog itself to have the option (e.g. "X Dialog remembers size" / "X Dialog always maximised")
Cheers, David