The role of the 7 has changed since the law crackdown started at the beginning of the 2010 S14. Sometimes the referees have lapsed but by and large the 7s have been obliged to observe the breakdown laws as they were written. This is an interesting concept that could possibly be applied to other laws - as they were written. But I jest.
Strict compliance has seen the specialist fetcher marginalised if he didn't have much else to his game. If he didn't evolve he was dealt with harshly in a Darwinian manner and failed in the race to survive with the fittest.
Most of the good 7s survived: McCaw, for example, was never just a fetcher and always an all rounder, and George Smith would not have had a problem with the crackdown at the test level either.
The best 7s even evolved their cheating ways. McCaw's favourite ploy of tackling but sliding his body down the 'wrong' side of the tackled player as he did so stuck out like dogs balls under the crackdown, as it did to me before it. He evolved into a blocker of opponents running lines and interfering with opponents as he ran back on side.
Evolution.
yourmatesam
Interesting.
Darwin told us that were many dead ends in the Tree of Life and many beings, human included, did not emerge at the top of the tree - but often out to the side of a minor branch. Who would have picked it?
You never know: the sneaky practice you mention may give 7s an evolutionary advantage if referees branch off with them and condone what they are doing, thus establishing a horrid convention that will have to be addressed with a crackdown further along the branch.