- Ahem, may I?
First of all the launcher is an application that represents a shell which displays your usability options. Let's make some comparisons as it's easier this way.
Imagine that your phone is a PC running Windows. Now, if you don't have the explorer.exe process running, which is a shell, you won't have the task bar, start button, icons on the desktop, can't access programs/games, etc. Your options are very limited and you cannot use almost any features, except the fact that since it's an OS based on different applications, the dialer screen will appear when receiving a phone call, alarm clock will be displayed and so on.
So basically you only need the Launcher to see the list of applications and to be able to run them. That's about it. The themes on the other hand, affect the icons, wallpaper and launcher's graphics. That's it.
Every other application has it's own graphics and appearance style.
*the text below is an assumption*
As for the screen you are trying to remove/clear, well that's a different problem. It might be the dialer application that has this screen and without the application you won't be able to dial any numbers and cause a various number of problems.
*the text above is an assumption*
- Thank you for your attention.
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CM9 for ChaCha on XDA Portal!