I only have my own experience but Gigi loves company and the more action the better. I have 4 little grandchildren that are active and noisy and Gigi spends a lot of the time on the bottom of the cage trying to get a closer look. She plays energetically with her toys to impress them. She does all her trick whistles and sounds! She is not afraid at all. They can all ask to touch her beak and she comes to the close edge of the cage for a gentle touch. Last week she came out of the cage when they were here. They all calmly sat on the sofa and Gigi flew out of her cage. Eventually she landed on the back of the sofa and paced back and forth, thinking she wanted to drop down on a little shoulder but couldn't get up the nerve.
But they loved seeing her fly! Mimi (me) was a little nervous but I supervised
very carefully.
And on the flip side, if I read a book sitting next to her cage, she often comes down at my level, plays, eats and then takes a little nap. Gigi clearly is thriving because we spend a lot of time with her. If I couldn't commit this amount of time and energy, I would have probably gotten a pair from the start. More than likely, it would have been a completely different experience.