Gavin, I think the point that BJ is trying to make is most people use carbide bits and while they stay sharp much longer than HSS they are also brittle and sensitive to impact. Just starting a router with a carbide tipped cutter in contact with a fence is a recipe for disaster; the carbide will peel off the bit and go sailing. My guess is the video used HSS bits which can withstand impacts better but dull much faster. Interesting designs but I would not recommend that a beginning router user tried them.
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