The link you provide is interesting, though I think a big factor that it overlooks (that supports the same trend against the value of traditional management) is lean methods, which (while they are now applied other places) really emerged out of the most concave work (routinized production) and while they demand a certain amount of management in the traditional sense, narrow and focus the scope of management (and, in essence, make it more technical) while providing more involvement of line workers in substantive decision making.
Traditional management isn't just becoming less relevant because of "convex work", its become less relevant because it is an outdated social technology even for concave work, for which more-efficient replacements have been developed in the last several decades.
Traditional management isn't just becoming less relevant because of "convex work", its become less relevant because it is an outdated social technology even for concave work, for which more-efficient replacements have been developed in the last several decades.