It takes a lot of energy, so you have to come out of it sometime. No, you can experience it in everyday life. There is an influence, but Laslo's work was not empirically based, and covered only the highest part of the spectrum. He is worried about linking flow with either performance or productivity because you lose awareness of the experience in light of the outcomes. Meditation is a form of flow - an excellent one, but without external structure, so it is very difficult.
Flow is a kind of energy, but has no particular morality to it.
The greatest challenge for adults is to teach their children to find pleasure in doing the right things. He hesitates to tell people what they should do. Clinicians find people spend a lot of time doing things they don't enjoy. No, though some diseases, such as attention deficit disorder can be presumed to interfere, as could psychological distress, and a lack of a sense of safety. It had questions about where they were, what they were doing, what they were thinking about, and why they were doing what they were doing at that time.