One size fits all. This may be true in many contexts - Snuggies, athletic socks, certain Panama hats, maybe - but not carpentry! And certainly not carpentry on new construction!
This window is so high up and so far from the driveway that even the telephoto lens doesn't do it justice.
With the camera:
Too close and you would not be able to see the whole thing!
Too far and you wouldn't have a proper context for the problem!
This appears to be just right.
Can you see the horizontal trim over the window.
It is 2" too short.
Well, in carpentry, size matters.
How best to hide the fact that this was measured once and cut twice, too short?
Set the little fellow in there right in the middle and fill the sides with caulking!
And don't bother to fill any nail holes!
It's far away so nobody will notice!
Well, except some snoopy home inspector who might just put it into a blog post. But I doubt that will happen!
The caulking elsewhere wasn't so well done either! Caulking is an art form, in addition to doing it right!
Oh, and a caulk "bead," that line you see when completed, should not be any wider than 1/4". Read the label! The print is small and it's usually in English, but try to read it anyway...
My recommendation: on new construction, have a look around! Look high, look low, and especially look around with a binocular. And get a good one. I recommend 20x.