almighty_monkey - 11:02 am on Oct 19, 2011 (gmt 0)
I'm willing to bet this is more to do with Google's lawyers than Google's engineers or product teams.
In the UK, there is the Data Protection Act, which generally dictates that any personal information must be kept 'secure'. I assume most of the world has similar laws on their books.
If Google are to track your search history, that could potentially include personal information, and Google would have a legal duty to keep that personal information secure.
I don't think they'd bugger up Google Analytics unless they absolutely had to.