Fair enough. His arm was noodle when he retired.
The death of Philip Rivers arm was declared as far back as 2010. He went on to play another 10 years in the league.
He did have a unique throwing style, memorably referred to as looking like a medieval trebuchet, odd, but effective.
His strength was navigating the pocket, and reading defenses. He was not known for his deep ball, though that is not to say he couldn't pull it out when needed. It is unclear to me if this is more due to scheme or physical ability. Either way, he didn't need it to find success, and to have a potential HOF career.
Being said, he could still sling the ball when called upon to do so.
This was a 48-yard dime in 2020, his final season.
And some more highlights. He didn't have a canon for an arm, but it was hardly a noodle. There are plenty of 20 plus yard lasers in here. Most with great touch.
His average yards per attempt in 2020 were about 0.3 yards under league average, despite having a weak receiver corp. T.Y. Hilton, who's next two seasons consisted of 331 yards and 121 yards receiving, was his leading receiver with 762 yards. He also had Pascal, Pittman, and Hines. He still managed 4,169 yards, while his rookie running back, Jonathan Taylor, netted 1,169 yards.
There are a ton of posts claiming he had a noodle arm, but I have yet to see one showing evidence to back the claim.