1. Use one command to install packages from Homebrew, Homebrew-Cask, App Store, and tweaks.

2. That single command is saved on the cloud so that it is repeatadable.

3. It simplifies the process of installation and shortens the time needed.

The most meaningful use case is when a user needs to install packages on a new Mac. There might be a couple dozen packages to be installed. It would take half day to install them manually. No one would remember all of them when people only buy a new Mac every few years.