You have it exactly backwards. Goff's performance with the Rams doesn't require excuses. It was pretty damn good. But when someone calls it out, as you did, it's fair to respond. And imo it's about time for a reassessment of Goff who is now leading the second top 5 offense of his career.
What needs revision is the absurd narrative that Goff was a bad quarterback who was primarily responsible for the Rams failure to achieve more even while they continued to have winning seasons in 2019 and 2020. Fed by McVay's impatience and his inability to address his own weaknesses as head coach and roster builder, suddenly Goff was a bum.
Of course, the reality is that Goff's and Stafford's and almost any QB's performances are very highly dependent on the talent and coaching around them. Football 101. Imo the Rams in 2019 and 2020 played up to their overall talent and coaching. Goff's performance reflected the offense's inconsistency-- in particular the oline failure to protect on the downfield passing plays which, as we all know, McVay loved to call and keep calling. No matter what.
If you want to continue to blame the team's performance at that time on Goff, fine, go ahead. Agree to disagree. But just imagine for a moment applying that kind of standard to Stafford who had eight losing seasons and never won a playoff game in Detroit.
Now Goff is the QB of another team which, like the Rams, he helped rebuild from nowhere and nothing to a top offense in the league. That kind of lightning doesn't strike twice without some commonality of high level performance and leadership by the quarterback.
And if you want more winning, stay tuned.