In practice
Automated bidding needs clean conversion data and enough volume to learn. Switching strategies resets that learning, so we change one thing at a time and wait out the window.
Target CPA and target ROAS are the same machinery pointed at different goals; picking the wrong one quietly reshapes who you reach.
Why it matters
Bidding is where the conversion definition becomes real money. Feed it a loose definition and it will optimise straight into the wrong audience.
Related terms