After using many kinds of Minecraft launchers,I think the launchers can be divided in to two parts:CLI and GUI.
The CLI part should be able to do everything that the launcher need to do by some simple commands.
The GUI part is used to call the CLI launcher,and make the launcher easier to use. It can also have some unofficial function.
It’s not easy to make a highly customizable GUI,but this design can make players design their own interface easier.
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