It's part of the chess match. Samsung creates pretty much identical,perhaps even better UI based on iOS. Apple looks at what will be hard to copy and determines that deep GPU integration in the core OS just isn't going to work in the permutations of CPUs that Samsung has to support. Apple finds a way to use these features to marginally enhance the OS experience, but in a flashy way that can be sold in TV commercials and just looks cool when people are in a phone store.
Now you're Samsung: do you spend a ton of money/effort trying to clone these effects, or do you first see if you can convince people that they are actually a bad thing? I know what I'd do.