"The entity knows where it is why do you need to know?"
For one thing, a person could determine the size of object by knowing
exactly where cursor coordinates are. Handy when scaling object to fit
a certain footprint for example.
I've come across the need for this on occasion, and wanted to find a
ruler entity (I think someone did that), and there's been a few other
uses for it in scripting...
So what I've done in the past is take an object of known dimensions--
'sandy floor' for example includes in name '400x400', then when I
wanted to lay out plots of 2000 segments square, I scale it @ 500, 500.
Luckily the scale is saved after test game.
I can then use that to mark out 2000 segment areas (use a texture line).
Just not all items reveal their sizes. I like to measure out things like the
width of rivers or size of buildings on Google Earth's ruler. I'm weird.
In my weirdness, I cannot fathom the deepness of the world's deepest
river- do you know how deep it is?! Can you fathom that? It's crazy!
https://www.cntraveler.com/stories/2015-09-28/odd-thing-about-the-worlds-deepest-river-congo-africa