I must print out your words and post them on my studio wall! Thank you.
I'm currently using both flake white (my current favorite brand being Rublev - from www.naturalpigments.com) and a pure titanium white made by Old Holland.
For large sizes, I use flake white only. For my tiniest paintings, I can do them in half the time if I use titanium white only. I mix the paints together for other works, depending on the size.
Titanium white dries slowly. Flake White is a fast dryer.
Titanium white covers better, Flake white is less opaque.
The camera likes titanium white better, so I would recommend it for illustrators.
Flake White looks better in a painting on the gallery wall.