Apple has had no such culture internally and they sure as heck don't emphasise backward compatibility to their customers (users or otherwise) - if anything, Apple prods and nags their developers to stick to the latest SDK/platform APIs, and shove the burden of software compatibility and maintenance onto them and hand wave away the breaking changes as being part and parcel of membership in the Apple ecosystem. This attitude can be traced back to the Steve Jobs era at Apple. It's definitely not new and comparing what Microsoft does with software and backward compatibility and expecting Apple to do the same is not fair - they really are different companies.