The "Save As" feature isn't lost. And the modern document model (auto save etc) can be opted out. You can still let the system ask you whether you want to save

The "Save As" feature isn't lost. And the modern document model (auto save etc) can be opted out. You can still let the system ask you whether you want to save a document. And the "Save As" menu item can be assigned a custom shortcut that's the same as what it was in Snow Leopard to protect your muscle memory. Instead I appreciate features like having unsaved documents be preserved across reboots. Sure for the average user who doesn't customize their system, the feature is lost. But is a feature lost if it's really hidden?