I've only hatched one clutch of 6 eggs so far, so the sample size is nothing. I didn't cut at all. Just let them pip and exit when they were ready. Everything went perfect. I actually never have planned to cut, mostly for the reasons you speak of. I figure the species has been doing it just fine for a gozillion years without any help. Why fix what ain't broke? I have no proof of what I am about to state but it is what I believe. I have seen so many threads where there have been issues and mortality problems and it seemed in almost every instance the thread included the following, " I cut on day.......". The other factor is that in 100% of the same threads, the paint job didn't change as a result of the OP cutting it open to see it. So why not wait?
Just my $0.02