This thread is a perfect example of why you won't see many videos on it. Newbies are way to quick to pass judgement on things when it goes against what their internet experience has shown to be right or wrong.
Regardless of if you like it or not, it is common practice. The reason it is common practice by the way is because if you know what you are doing and what you are working with, it is harmless.
I couldn't care less what others think of my practices. I do what works for me and my animals. I just hatched out my last clutch of the season. They were on day 56 when the first baby started to cut the egg. I was anxious to see what everything was so I ripped the other 6 eggs open. All of the yolks were obviously already gone so I went ahead and dumped them out of the eggs completely and washed the slime off of them in the kitchen sink. Now they are sitting nice and clean and happy in their tub waiting for their first shed. 2.0 Super pastels, 1.2 Pastels, and 1.1 Normals.