One difference between 10.7 and 10.10 is that 10.7 cost money and 10.6 kept working as before. It was considered perfectly normal to stay on the old system and

One difference between 10.7 and 10.10 is that 10.7 cost money and 10.6 kept working as before. It was considered perfectly normal to stay on the old system and be productive. (The Windows world is still "sane" in that way.) Now Apple and the internet army of Early Adopters have united and it works like that- 1. iOS 8 is released and you have to update (if you want to receive security updates) 2. If you accidentally enable iCloud Drive or use a new version of iWork, you need the Yosemite Developer Preview (or wait for 10.10.0) 3. Now you are using iOS 8.0 and 10.0.0 and live through six terrible months. It's a lot harder to be a "slow adopter" nowadays, especially if you live deep in the Apple ecosystem (iCloud, iWork).