I think the idea is that the display kinda represents the shot, but not well, but if you cared you wouldn’t be shooting with a $29 camera. I mean, it takes 1920x1080 pics, don’t get too picky there, Ansley Adams. :-)
But I agree with you, I don’t see how the “viewfinder” is all that useful, other than “nifty!”.
But if it’s giving you no information about what will actually be in frame you might as well just look in front of you and guess