macOS, when it was called OS X, used to get released whenever it was released. It usually had some bugs and those would be worked on over the lifetime of the release. After Steve Jobs died, Tim Cook decided to switch it up to a yearly release schedule. That was self-imposed. Since then, Apple’s software quality has been steadily declining. They have no one to blame but themselves, yearly releases is not enough time to introduce new features and polish and fix bugs in old ones. And they keep adding more operating systems, making it hard on themselves when they have proved they can’t do it.