Because bid automation is a standard capability in the market that allows a lesser degree of precision, based on the conversion opportunity of each auction.
Because cross-referencing data with context to establish intent and set the appropriate bid is a more simple, direct task.
Because given the dynamic nature of Google’s auctions, the appropriate bid can often be a moving target that’s challenging to reach at scale when using manual bidding.
Because users’ intent and their likelihood to complete valuable actions for your business hardly vary based on location, time, or device.