I was surprised by the fact that Google no longer passes along the search query for logged in users. Checked my analytics account and it is now about 7.5% of al

I was surprised by the fact that Google no longer passes along the search query for logged in users. Checked my analytics account and it is now about 7.5% of all organic search traffic and climbing up. Anyone know the rationale behind this one? How does this help in fighting the spam? Or how does it improve search experience?