If you can play 1 position better than anyone else you'll always get picked
Coaches like to have on field options
Being technically adept is not the most important reasoning behind any players ability to be multi-positional
I liked the article bringing up the question "what is the actual desired end result".
for instance using the Coerver model with 10000 touches regime would improve both ASB Prem and Mainland MPL / WPL in 6-8 years time.