Yes, indeed.
It can be very hard to break out of a preconception - I may have suffered from an example of that today since writing my previous response. Now I'm trying to figure out how to choose between two possibilities.
That's the necessary and sometimes beneficial /first/ part.
The separate second part, analysis and pruning, is also necessary.
Yup.
Depends on whether they are primarily ideas men or critics.
Also it is easier to be remote critic and more difficult to force remote suspension of critical faculties.
Been there, done that. I expect everybody on this group has.
You are lucky to have a customer that can meaningfully review it; it isn't guaranteed!
Depends on the person, to some extent. "Ideas men" habitually spit out ideas, but have little follow-through after they spit out their next idea. That's an "allowable weakness" provided another team member counterbalances it.