Question Up Front
Why are door trims at the floor not cut at 45° like everything else is? Is it a style thing, or is there a functional reason for it?
I have noticed in many houses that the baseboard is mitered and beveled so that the pattern of the baseboard continues seamlessly.
The bisecting miters and bevels seem to be everywhere except for the bottom parts of doorways. The example below shows a doorway with a different trim than the baseboard, but it doesn't seem to matter whether they're different. The bottom of the trim is always cut at 90°, not 45°.
Is there a functional reason for this, or is it just a ubiquitous style?