Chris, the WW-II is available in a "flat bottom" grind, but the normal version does indeed leave some scoring at the edges of the kerf. It's a trade-off...the scoring by the high angles is what helps provide the really great cross cutting edge quality. Different blades from different manufacturers will often have less scoring. Anyone who frequently uses their "normal" blade on the saw to do grooving, especially wider ones or for splines where more of a flat bottom is desirable should take that into consideration. For wider cuts, they can certainly be cleaned up with a router plane or an electric router...which is fine for infrequent situations...but if you do that a lot, use a blade with a raker to clear things flat or a dado set that's designed for flat bottoms. (Forrest's Dado King also scores at the edge)
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The most expensive tool is the one you buy "cheaply" and often...