It already exists, and it's called Drupal. It's entire goal/purpose is to allow you to do everything through the user interface. There is a very large group of

It already exists, and it's called Drupal. It's entire goal/purpose is to allow you to do everything through the user interface. There is a very large group of 'Drupal Developers' who build entire sites solely through the admin interface. It also has different install profiles/distributions for pre-built niches. I used to be want the same things as you do, but it has taken me many many years to internalize the lesson that somewhere, somehow, you WILL need to write code to reach your goals. The more you try to dodge and dive around that core truth of all software, the harder the code that you will need to write ends up becoming.