So this is why I should not download iOS app from iTune

I was trying to use my iTunes to add some music to my iPod Touch in the office using my X60T (but still use the same iTunes library folder I used at home with Mac Mini), and I got a warning message saying that I need to AUTHORIZE my X60T, or 46 apps (which are the ones I installed to my iPod Touch using iTunes, including Instacast) will be removed from my iPod Touch.  I was like, that's just bullshit.

Fortunately, I can hit [Cancel] to bail out of it, and that DOES NOT affect me adding more music to my iPod Touch.  But this idea of managing app using iTunes is just super stupid to say the least.  I hope Apple can get rid of that shit soon.

But then I later figured out a way to get rid of the problem once and for all, and it's actually pretty simple:

• Back up your iOS device to iCloud.  After done, double check to make sure it's there.
• Connect your iOS device to that shitty problematic iTunes.  It will prompt that Authorize-or-apps-will-be-removed message.  Click Unauthorized and let it deletes all those apps that installed from desktop iTunes from your device (you DID back up to iCloud before, right?).
• RESET the iOS device ([Setting]-[General]-[Reset]-[Erase All Content and Settings]
• Once the device back up again, you will have a chance to restore from iCloud backup.  Do that, and pick the backup you just did a while ago.
• Now since all apps are REDOWNLOADED directly on the device, they are no longer tided to any particular iTunes library.  From now on you are free from the chain of desktop shitty iTunes application.