That being said the gap from Lynnwood to Centralia (formerly Arlington to Centralia and prior to that Burlington to Centralia) is quite egregious.
I frequently make trips from Marysville to Olympia and back and prior to Lynnwood, I had to drive well out of my way to Centralia before heading back north. These are basically the edges of the Seattle metro area from a north/south perspective so it's not an uncommon route. Driving a (degraded) S90D, Lynnwood has made it possible to avoid the Centralia detour, but those with smaller batteries may not be so fortunate.
The Centralia to Woodburn gap was also really terrible, but the opening of Vancouver has alleviated that. Before Vancouver people travelling to Portland and back from the north would often have to detour to Woodburn just to make it home. Again this is a really common route for people who live in the Seattle metro area.