That extension was the only way to get Rodgers' 2022 cap # down to something manageable for them to field what they thought was going to be a title-contending roster last season (reduced Rodgers' 2022 cap # by almost $20M, freeing up room to try and get Davante Adams signed). It was an extension that essentially gave them the option for a year to year approach of where both the team and Rodgers was each offseason, knowing at some point they'd likely either eat a big dead cap number and/or trade Rodgers. This is what happens with every team and a veteran HOF quarterback nearing the end of his career in the salary cap era - eventually all the extensions and salary cap can-kicking needs to stop. More often than not when that happens, the following season looks alot more like what Tampa Bay is dealing with in terms of being forced to burn it all down with cap casualty cuts and likely be forced into a lengthy rebuild in a dud year or two. As it stands, the Packers aren't forced to do anything at the moment even with Rodgers' 2023 cap # on their books, and they've got a young quarterback ready start without needing to find an immediate heir apparent in this year's draft.
It's not a no-lose situation for the Packers, but boy it could be a helluva lot worse than it currently is.