Riot releases patches back to back to back that snowball the game and end it earlier. They have stats that show they're making games end earlier and earlier, yet they release a patch considerably delaying the build of crit marksmen by forever without releasing a single thing to increase game length along with it. Then pretend to care about game length now that they've "surprisingly" dumpstered half the marksmen pool.
This is a prime example of meta shifting, not balancing. They wanted to see Lucian and Draven etc. played, so instead of trying to balance the game to make everyone viable, Riot gave up and just dumpstered half the marksmen so people would play them by default.