Of course, when doing a clean install, any previous Launchpad info would be lost, hence my question.
To say it makes no sense to restore it is like saying it makes no sense to restore any app preference after doing a clean install of the app. So according to you, users should keep on manually re-inputting all their preferences, account details, etc. after each fresh install? And if we follow your logic, after a fresh OS install, all the user data are lost and there is no way to retrieve them?
To claim that the info would not be valid does not make any sense. Launchpad data include apps located in the Application folder, and their organisation. When you do a fresh install, many apps are re-installed: they do not disappear. And even if they do, like user installed apps, the user can always and of course put them back. So the Launchpad data are obviously fully valid after a clean install. The only issue is while the content is there, the organization is lost. Two options appear. 1) The user manually re-organize things, but the process is time and energy consuming (clearly, you have never done that). 2) A simple copy & paste of the Launchpad "database" does the job very quickly, hence my question.
Launchpad is not part of the OS. That's factually inaccurate. Launchpad is an app that is meant only for a user. Think about: what would the OS do with this app? No OS needs a Launchpad. It's like the Chess app. No OS needs a Chess app.
Do you know where the Launchpad files are located? Clearly not. But that's the only useful and needed insights.