The difference is in the "when". Broadly adopted standards do not get dropped all that quickly; in this case the content or hardware providers tend to be followers rather than leaders. Apple is a bit of an exception, they like to come up with their own standards and are a bit quicker to drop stuff they think is becoming obsolete. But where a single provider owns the standard, things tend to change a whole lot quicker. And where standards change quickly, older versions of the standard get dropped faster; it would be too expensive to maintain backward compatibility. This is what businesses are discovering in the world of SAAS (software as a service) as well, especially on multi-tenant systems. Providers like these want to remain on the leading edge and are forcing everyone to follow along, even if theirs are paying customers.