Correlation != causation. If it's really bothering you, I suggest you go learn out how redfin calculates their est. and figure out why in those 20 cases their est was low but in Seattle it's "high". Also 20 is not a statically significant sample size for the many MANY houses redding estimates prices for. (But even if it was, still wouldn't address the real issue)
Redfin estimates were the best couple years back. Zillow was horrible in Seattle then. Once house prices dropped last year, redfin estimates dropped but failed to drop as much as market. Zillow estimates - although they were already low, dropped again
Now both are screwed up. Redfin is still reasonable compared to Zillow
Btw, Seattle market is falling knife right now. If I were in the market, I would wait. Even if there’s no crash, price isn’t going up in next one year for certain. Zillow predicts it will go down by couple of percentage in one year.
Your report :). Also worth noting that zillows estimates are commical so wouldn't put oo much weight on this report regardless. The reality of real estate is location location location. Desirable locations are always hot, the area's around the edges will vary widely.