I hate

I used to do the breakfast shift at a fast-food joint bitd. Two eggs one-handed in both hands was definitely the way forwards when cracking 100-200 eggs for scrambled eggs!

Similar here. I do it one handed out of pure force of habit.

Don't do one in each hand though. Egg is cracked into small bowl, visually checked and then tipped into whatever it is going in to.

Bad eggs are rare but when you crack one into a bowl of batter mix that has already had ~30 eggs cracked into it used to spoil my day (and the batter mix).