I guess it depends on the body of water and the nature of the fishery. In many salt water and some fresh waters the fish are scattered over such a vast area there may be no other way to have a chance than to chum. Shuffling is usually only effective in the first few miles of a tailwater or spring fed trout fishery, a very large quantity of fish in a very small area.
We all except the rules that we have to fish under because it levels the playing field and encourages the element of fair chase. When a trout fisher uses bait in an artificials only area he tips the scale wildly in his favor, ignores fair chase for the goal of accumulation.
When I started fishing White River in the late eighties it was a common practice to herd large brown trout into a very small area, hem them in that area with a strategically placed boat(s) and drop bait in front of their nose. This tipped the scale wildly in favor of the herders, skirted around the element of fair chase and harmed the fishery. Arkansas had the foresight to make this activity illegal. Cumming on White River followed much the same path from excepted behavior to unacceptable. When these laws were passed some who had fished this way thought the world was coming to an end. Over time the restrictions were accepted, people changed their behavior and the fishery benefitted.
I believe when people are exposed to sound ethical practices they begin to see that a level playing field is best for them and their sport. As evidence I see the long cherished practice of catching a limit of trout in the morning, consuming that at lunch then going out for another limit after lunch as a fading behavior in Arkansas. Change takes time, with sound science based fishing regulations, education and ethical practices our fisheries can be maintained and improved.