Never heard that before and never had a problem either. I candle everyday from day 3 to lock down. Mostly it's for the 20 mins of cooling time. I've had awesome hatches since I started doing this. In my last 2 hatches I only lost 2 eggs and that was because they were clear. Everything else hatched.
Then they didn't actually come from MPC. Probably Meyer since that's who they seem to do the most drop ships from.
I wouldn't exactly call it an addiction.
I do it often with chicken and duck eggs just because I want to see what they look like at the different stages.