He did - that's why I said wins and losses are a TEAM stat and not a QB stat.
Goff's decline began in week 13 of the 2018 season against Detroit. A game in which Gurley was great and Cooks was fully healthy, and it was 2018 so I'm assuming that's what you meant by better coaching?
Since then Goff has had some good games - but that's when the inconsistency began and became a trend - Detroit, Chicago, Dallas (playoff game), New England, Carolina, Cleveland, Tampa Bay, SF, Pittsburgh, Chicago, Baltimore, Dallas, SF, Miami, SF
This is roughly half the games during this span that Goff has not been good enough in. Some of these games we won, but that doesn't mean he played well. Some of these defenses are great. Some of these games we were on a short week vs a team off a bye.
But this is 15 out of the last 34 games that Goff has played poorly. By poorly, that's going to change for some people, but for me with Goff it's an eye test thing mixed with stats. He was either inaccurate, turned the ball over too much, or the offense sputtered too much in all of these games.
So while you say even great QBs shit the bed sometimes - I agree - but I think there are some of us that are fed up with 10-15 (depending on your standards) out of the last 34.