I've seen many videos as I was looking to refresh my sharpening technique.
Many different methods! I've sharpened with a flat file at 30 deg with sufficient pressure to produce a burr. I've always thought it worked just fine for general work. If I was flattening a finish I use the squared off edge. I could see where the burnishing tool would problem develop a more uniform and smaller burr - that would be desirable for detail work - like finish flattening.
A couple quick strokes with file and I'm in business.
What am I missing?