Timber Framing Router jigs

[jmbfestool]

JMB said  "using TS55 to cut shoulder both on male and female part of dovetails and then used a makita circular to cut up the grain to cut the angle on the male part."

What is different or better about the Makita for that purpose?
Or was it just to have two saws set to different angles or depths?

Cut end with TS
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Mark out dovetail and use makita on endgrain to cut up and down with angle set on saw
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Use TS to cut shoulders
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