For one thing, they got a new producer. But I think it mainly has to do with age. These guys have been around since the 80s. Dex kinda screams everything when he sings, and that's gotta be taxing if you're in your 40s or 50s (I have no idea how old he really is). A mellower sound is a lot easier to handle. Although I happen to think Rise and Fall is a great album. If anything, I'd say Smash is my least favorite. Not to say its bad or anything, I just don't like the style they were going for. Although my favorite album is Ixnay. Days Go By has its good songs, but overall nothing all that new or interesting. Even Dirty Magic sounds kinda...meh. Turning Into You is probably my favorite song from it. Days Go By is also the one Offspring album I don't own yet.Speaking of The Offspring, was there any reason why they changed their musical style? Starting with Rise and Fall, Rage and Grace, they transitioned from punk-rock to a more pop-punk style (listen to "You're Gonna Go Far, Kid" ). Their newest album Days Go By seems to be the same too.
But you know, even Americana was straying into pop-punk territory.