Those little foam brushes are great, but they dry out and become brittle between coats.
In a garage or crowded workshop, it's time-consuming to reposition stationary tools on a level spot.
Finishing small pieces is frustrating. Using your fingers to hold the pieces is messy, and the finish may stick to your work surface.
Sometimes tight quarters restrict you from steadying a screw with one hand while you turn a screwdriver with your other hand.
Bench dogs are great for holding straight-sided work, but they tend to lose their grip when you ask them to hold curved surfaces.
A tight collet prevents your router bit from slipping up or down, and ensures safer routing. But those tight collets don't loosen easily.