Over the years, I have tried enough NAS operating systems to know that most of them are designed to cater to a particular kind of user. Some are made to be beginner-friendly, while others are better suited for experiments. But all of them want to lock you down to their own ecosystem, which is especially true for pre-built NAS models that you get off the shelves. When you want to try something even mildly unconventional, you will start to notice the constraints.