What are the benefit of locking an already v-synced framerate?

I've noticed some games run with less stuttering when I apply a 60fps lock, when already using (adaptive)v-sync on a 60Hz screen. Why is this the case if the frames are paced directly with my screen's refresh?
Best Answer
Your comment about locking FPS in RTSS, disabling in-game v-sync and using adaptive v-sync in control panel changes the question quite considerably. In this scenario, game can have less stuttering (and lag) because you are running it without v-sync, FPS will never go above your monitor refresh rate (here 60), so adaptive v-sync in drivers will never be utilized.
But this would mean you would see tearing because outputting frames from game and refresh rate of the monitor are not synced (even if it's 60FPS@60Hz). Do you see any tearing?
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