Those first two lines, the first one in particular, sure spell out a major part with what's wrong with software development in recent years... Admittedly, as long as security updates continue to be provided for old versions, I do agree that it's not really a problem, and those who specifically want the newest features should probably be expected to also stay reasonably up to date in other aspects as well. But that'd also require WP not pushing for major version updates in the manner it does either, so less savvy users won't find themselves updating (or even automatically updated) to the newest WP without really meaning to.