Not impatience at least not on my end since I cut at day 58 or 60
A long time ago while visiting NERD, I learned that sometimes not everything was going as smoothly as it should, while rare the egg tooth sometimes break, matter of fact that weekend 3 hatchlings had drowned because of it, since than I cut my eggs. I do not cut out of curiosity but just as an extra step to put all the chances on my side (same thing when I use an incubator instead of relying on the female). Since I have also experience with twisted umbilicus which I also solved successfully.
Sure there are impatient people cutting 5 to 10 days before the eggs are due and cutting HUGE holes VS a small flap and this could possibly jeopardize the hatchlings, allowing them to dry out and be exposed to bacteria, and to me that is not worth it, if you manage to wait 50 days you can wait another few more and cut when the first animal pips or when you know that you clutch is due.