So what is up with the built in Google backup's inconsistency

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http://forum.xda-developers.com – Not really a question so much as a rant/discussion/question mix. To let it be known up front... I use Ti Backup for backup and restore of apps. But the built in Google Android backup... Its just so inconsistent... and not from the "not all the apps and data backup" perspective... But from the "sometimes it never restores and sometimes it does" perspective. I just flashed a CM10 nightly on my Gnex, after running CM9 for a while. It started restoring all sorts of apps imediatly, some I stopped using months ago. I went into the market to download Ti Backup, and (HowTos)