Are Speakers Like Cask-Conditioned Beer?

Are speakers in general, and drivers specifically, like cask-conditioned beer?  For years I've read about speakers needing a 'break-in period'. This has me pondering whether there is a curve up to an optimal point for speaker drivers, like the perfect timing for discovering a spot-on cask conditioned ale?  And I wonder, are there differences for driver materials, magnets, size of drivers, etc? Is there a decline from the optimal point? I haven't read many audiophile comments about the length of a speaker's 'break-down period' (if that's what we might call it) and how long that might be? Hey, there's a whole new category of audiophile commentary that could give -- like Consumer Report ratings for cars -- the predicted or actual longevity of speakers. :-)