This. Apple is really good at iterating, and nobody gets it right the first time. The early "cats" had lots of time to mature (look at how long Tiger persisted,

This. Apple is really good at iterating, and nobody gets it right the first time. The early "cats" had lots of time to mature (look at how long Tiger persisted, my personal favourite) and I think Apple should strongly reconsider the annual cadence to allow that to happen again for macOS. They just changed the whole filesystem, for crying out loud. That needs time to settle. There's also the fact that Snow Leopard will run on any Intel Mac, and I think a lot of people remember how (necessarily) light on its feet it was by comparison with what followed.