What happens is some new beekeepers do not prep the hive correctly, and then they have problems. If you have the queen removed from the hive for requeening or splitting, and have waited a period of time (24 hours), then the bees will take the queen, whether she has attendants or not. I have seen some do a split and then place a queen at the same time. Perhaps taking the attendants out may give you an edge, as compared to leaving them in the cage. Myself, I would rather give the bees the BEST chance, regardless of attendants or not, and make sure the hive is PREPARED to receive her. I have never had any loss to even make a note about in regards to with or without attendants. When you do it correctly, then the bees will almost certainly start feeding the queen and other bees, as soon as they can stick their tongues through the screen.
Then you throw in those observing situations where a queen would not be taken regardless of other bees, like when a second queen is present. Then you here the story of one queen being killed, and the hive raises a new queen. So the next year, they are seeking what could of gone wrong, and they hear about removing the attendants. And almost magically, the queen is taken the second time.. And then they swear over and over again about some difference it makes to remove the attendants.
And if it were a problem for some, I would certainly suggest some sugar water, or maybe some HBH added, to throw off any aggressive bees. By the time they have all the smell and syrup cleaned up, they should be fine with the queen.
I have heard many fly away queen stories, damaged queens, and even possible queen problems from scent being transferred to the queen in additional handling, by those using "queen muffs", etc.
And I have also found that a queen, even though being balled, will survive (if no second queen situation) about 90% of the times. But some new beekeeper goes in, tries to save the queen, screws it all up, then blames the attendants. If they wanted the queen dead, they would just simply kill her.