I have been using Logic since it was Notator.. I dealt with the pain of Apple taking over from Emagic. Those were the days when you could call up Dave and just ask a question no problem. Zero call centers.
i am still running 10.4 with Logic 7.2.3, and it is as stable as can be. I have taken the G5 off the internet. I use that machine for a lot a composition. I have my studio built into the environment, with a lot of little tricks here and there that I have created over the many years.
Now I have another Mac on Mavericks, and I don't want to update the OS. I don't care if every computer can sync data after I take a pic or video with my iPhone. These are my workstations, and are not used for hobbie. Once I get them stable they come off the web, and then I use a thumb drive or other media to send out information.
I still ill do not like the way Apple forces system updates for minor software updates.
I wish BeOS would have taken over Logic. That was the underground word back in the day. A devoted OS/music workstation. Like you boot into Logic.
But as time has proven to me over the many years using Apple products.....Updates, latest and greatest and the like can actually set you back, and not move you forward.