Most of the miter saw (and even table saw) blades sold to the consumer market are thin kerf. The up side is thin kerf blades allow saws with less horsepower to cut more easily. The down side is the blades flex way too easily. Unless you very carefully control feed rate the blade will flex and degrade the cut. Miter saws are fine for what they are, but what they aren’t is a precision machine. In my shop, we use miter saws when necessary, but the final finish cut is often handled by either a table saw or hand plane.

Artisan Woodworks of Texas- www.awwtx.com