Basically you are free to install whatever you like manually.
Our advanced installation is not strictly related to the software version. More we offer an end-to-end experience to have software title ready to use for end user ootb. Like to configure ports, setup configuration and connections.
Of course on git it doesn’t make really sense. However we use git for other software title like PiHole. Therefore it’s in the list.
But on other software title it’s quite an advantage. like nextcloud. You don’t need to configure database, webserver and PHP.
If you like, you could have a look to the install script. There you see what we do.