Anytime you ask a question regarding incubating, hatching, raising, managing, or anything else about poultry, you're going to get a wide range of opinions. In the end, you have to just look at all those opinions, take your research, use your experiences, and make your own opinion.
There's people that have bad luck with detached air cells, and people who have had good luck. I'm in the latter group, as I've hatched quite a few detached. I have a few in the incubator (day 10) that have detached cells, and so far, they're fine. I also just set some more, I think 5, that were detached last night.