I think it's seen, by contestants at least, as very much the done thing to go directly to people and thrash out any issues you have with them and people who are later found not to have done that are then seen as in some way deceptive.
That was the crux of the 'who's the most honest' line up wasn't it. Those who regard being honest as fronting up to everything rather than simply not telling untruths. I thought Jess and Wayne struggled with that and I would've too, because placing someone at the end of that line didn't mean they thought that person was dishonest, maybe just less confrontational. They both used the term brutally honest I think, rather meaning I think you say too much that doesn't really need to be said.
In a work situation you might choose to keep quiet but confide with someone you trust outside of the workplace, or you may ask for a second opinion from someone you're close to professionally, or you might take the view that work is only a part of your life and you get to go home and leave the problem aside. In these sorts of shows, not only can they not do that, but there is almost no escape, even when they sleep their problem person could be in the next room, the next bed, or even lying next to them 
I think it's really easy for us to forget how much of a pressure cooker environment it must be and how it can affect people such as Malika, while people like Shane L and Ann seem unscathed. The time must drag so much and there's so little stimulation I suppose it's inevitable that the same conversations go around in circles.