What’s your business model and how were the campaigns performing before?
Were they struggling to spend the budget? Were they getting a good CPA before hand? Are you prioritizing AOV or volume of new customers?
I like Maximize Conversion Value usually on Ecom. But Max Conversions is just as good.
If they switched away from a ROAS target, it makes sense that spend jumped (especially if you weren’t spending the budget previously).
Switching to Max Conversions usually does result in a jump anyways, as it’ll spend over the budget for a couple of days to gather more data.
At the end of the day, you need to understand his hypothesis on why that change was necessary. We don’t know his reasoning so we can’t say much.