How does automating your bid contribute to a successful Google Ads campaign?

Automated bidding’s algorithms integrate a minimum number of signals to evaluate user intent.
Automated bidding uses machine learning to algorithmically help you set the appropriate bid for each and every auction. – CORRECT
Cross-referencing data with context to establish intent and set the appropriate bid is a simple and direct task.
The customer journey has become more direct, so setting bids should be based on general user behavior.