Even Stroud looks like he's regressed. If he has another season like this one next year he'll be right where Purdy is.
Tier 1 is Mahomes, Lamar, Allen, and Herbert. These are Generational QBs and should be paid whatever they ask for, automatic market setting contracts.
The next tier are Franchise QBs, so Purdy, Stroud, Burrow, Lawrence, Dak, Tua, Hurts, Goff, Love, and Stafford. These guys all have flaws but they're good enough to be the undisputed guy leading the franchise. When it's their time to get an extension, they get a top 5 contract.
Then you have guys like Cousins, Baker, Darnold, Carr and Geno. These are successful journeymen who you can trust to lead the season but not the franchise, so the FO will be actively looking somewhere else for the long-term franchise QB. They'll get a medium-term contract for around 15th in the league.