I've often contested this, too. How can they keep it up? (rhetorical)
I think this may fall on Apple, somewhat.
Before I got a new iPhone6s, my apps always crashed, lagged... was horrible trying to play. Now that I have a new phone, no probs! My point is, I guess, if the app works on a device but not the others... well... It does not seem fair, but it's the tech-world we live in now: buy the upgrade or suffer. *smh*