The name of the game in the modern NFL is treating the quarterback position like a puzzle. An elite QB will always elevate an offense, but sometimes, like a puzzle, the scheme doesn't fit quite right. That's how we saw Sam Darnold become a Super Bowl champion after four teams cast him aside.
Nowadays, every team is looking for their own Darnold, the Atlanta Falcons included. Finding a QB like Patrick Mahomes is an opportunity that only comes around once in a generation, so everyone is chomping at bit to give signal-callers who were previously looked at as draft busts a second opportunity to prove themselves, often times in a better situation.