There are pros and cons to every alternative. I think it could be argued that washing is not "good" for anything. The cost to benefit ratio of washing down that is really "funky" has to be weighed. I have a down bag that I have been sleeping in regularly for 6 years, it is time for the benefit of the lost funk and whatever wear and tear there is will be the con. I do think there are measures one can take to minimize the impact on down so it is more usable and "fresh." Each of us makes choices based on how we view the benefits and drawbacks. I like down, it works for me.
My wife swears by a pad for bottom insulation, I like an UQ. Point is we both sleep like the happy campers we are.