Removing metal to create a sharp edge, sounds simple enough to me.
I sharpen my chisels to a single bevel point, after some usage the edge begins to dull very slightly, leaving a moderately less sharp edge (I call it working sharp). This is where the sharpness and durability are in balance. A decent chisel will keep this balance or working sharp edge for quite some time before the edge needs to be addressed.
The Mythical creature system seems to be artificially trying to get to this point, which comes naturally with use. I ask, why bother.
I would like to know from those of you using two or three bevels, how do you use your chisel bevel down? It would seem you'd be at an awfully high angle of attack making it more difficult to use. Just curious.
Some may find this interesting/helpful
https://workshopcompanion.com/KnowHo...s_Cut_Wood.htm