Thanks for the replies from which one can deduce that the FCTM recommendation (at page 4.14 of my copy) which states clearly "Normal descents are made in the clean configuration to pattern altitude or instrument approach altitude." is unrealistic nonsense and Boeing should know better. Interestingly, on the same page Boeing say "Avoid using the landing gear for increasing drag. This minimises passenger discomfort and increases door life." Seems this is unrealistic nonsense too...