Google reps push hard for whatever they’re incentivised to do. This month it’s max conversions. Last month it was image extensions. Some time before that it was TargetCPA.

I understand that they get rewarded for things like when you increase your spend, use an automated bidding strategy etc.
Incentivising employees to meet the business goals is a common approach. Sales people are paid commission, executives get bonuses for meeting KPIs and so on. There is nothing wrong with this, but, sometimes employees game the system. They optimise for what’s best for them today rather than what’s best for your business in the long term.