I think it's the opposite.
Below is the disposal colour chart from the DFS website. Green is D50, Blue is behind the centre circle, Yellow is forward of the centre circle and Red is F50. The first game of the season is at the bottom and the last game at the top. The defensive mid is rarely on the last line of defence so that disposal from the half back line to the half forward line, blue zone, doesn't do the damage that a kick into the F50 or a scoring shot does, yellow and red.
Flanders and Sheezel went from very good backline roles to very good mid roles and arguably had better roles than Anderson and LDU. Dal Santo would have been a similar type at his best.
I agree with you to the point that the less skillful mid needs to fall back to prop up their scores, but I think the attacking mid has more chance of reaching a higher level.
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