The idea (and it's a semi joke) is that it will discourage more people from coming so it doesn't get spoiled.
A bit like telling people some tiny restaurant isn't all that good, because if too many people eat there, you will never get a table again.
These are the Seattle Tourism marketing months. Microsoft's college interns got the best weather of the year.
What they don't tell prospective residents is that the other 9 or 10 months of the year will be gray and drizzly/rainy, esp. December to March.
I could deal with the inclement weather, but one person I knew had to get a bright light to treat his seasonal affective disorder.
And I don't have any data to back it up, but it feels like the weather has gotten better (less gray, less drizzle) over the decades. Or maybe that's just Stockholm syndrome.
Still, I'll likely never move away.
I am hoping the Cascadia fault stays quiet another few decades, until I'm dead and gone. That, not the weather, is the thing that worries me.