Creativity demands solitude

A thought for you. ‘Creativity demands solitude’.
Do you agree?
As a magician, I find I create the procedure in isolation. But the plot often comes through collaboration with other performers, my director and magical friends (yes, I actually have magical friends!).
As a writer, I create in solitude, writing being, for me, a very personal experience.
As an artist, I work in solitude.
But in all disciplines, I know I can’t make it happen on my own. I need to team up with others. But at what stage is the creative journey done? Before making it a reality with others? Or during that phase, organically working and developing the concept?
Hmmm… An answer can’t be found in solitude. Or can it?