Performance Max is very good at one thing: finding conversions inside Google’s inventory. It is much less good at telling you why it found them. When PMax carries most of an account, three things quietly disappear.
- Visibility. You can’t easily see which products, audiences or placements are doing the work.
- Funnel control. Prospecting and remarketing blend together, so you can’t tell whether you’re creating demand or just collecting it.
- Spend allocation. Budget flows toward whatever converts most easily, often returning visitors and branded searches.
None of this means PMax is bad. It means it shouldn’t be the strategy. It should be one tool inside one.
Separate the jobs
Every ecommerce account is doing two different jobs: capturing demand that already exists, and creating demand among people who don’t know they need you yet. These need different campaigns, different budgets and different success metrics.
Capture lives in Search and product-level Shopping. Creation lives in YouTube, Display and Demand Generation. If both are hidden inside one PMax campaign, the algorithm will always favor capture, because it converts faster.
Give PMax narrower briefs
Instead of one campaign for the whole catalogue, build product-specific PMax campaigns for your priority lines. Add a Shopping-only asset group where you need clear feed-level performance. You still get the automation, but now each campaign has a defined job, and you can see which one is pulling its weight.
Build the funnel on purpose
- Top of funnel: top-of-funnel Search, prospecting Display, YouTube and Demand Gen to educate new audiences.
- Mid funnel: in-market audiences and product-specific PMax to move interested shoppers toward a decision.
- Bottom of funnel: remarketing to close.
What this looks like in practice
This is the structure I used for Petoi, a robotics brand whose account had leaned heavily on PMax. Over the October–December reporting window, ROAS went from 2.0 to 4.1, average CPC dropped from $2.30 to $1.00, and purchases went from 31 to 165.
Automation should execute a strategy. It shouldn’t replace one.
A quick check for your account
- What share of spend sits in PMax?
- Can you say which products drive most of your conversion value?
- Do you have a separate budget for reaching new customers?
- Is remarketing measured separately from prospecting?
If you can’t answer two or more of these, the account is probably running you, not the other way round.