A bespoke product builder has to earn the extra complexity it brings. A visual step-by-step interface can be useful, but it is not automatically the best way to sell a configurable product.
Before commissioning another custom interface, I try the product with the standard form and the information actually available. If the ordinary form handles the choices well, I focus on its layout, preserve existing product settings and keep a clear route back while making the change.
Start with what the product needs
Match the interface to the product information you can maintain. A visual builder that depends on images you rarely have may create more work than a well-presented standard form. Try real products, including awkward combinations, before choosing the layout.
WooCommerce’s Composite Products documentation is a useful starting point for understanding the extension’s own capabilities before deciding what needs replacing.
Check what still depends on the old version
List the products that still depend on the custom builder, including unpublished content. I review drafts as well as live products so that returning to an old item does not unexpectedly revive the previous setup.
Make the replacement an explicit decision for each affected product. Keep the previous code and configuration available until the ordinary purchase flow has been checked and the rollback route is understood.
Changing a default must not rewrite a decision
Check the meaning of stored settings before renaming them. Moving from an opt-out checkbox to an opt-in checkbox reverses the meaning of a true value unless the migration accounts for it.
Translate the old choice deliberately, leave an existing new choice alone and record that the migration has run. Test a rollback too: restoring older code should not silently change which interface a product uses.
Check the rules that hide the standard add-to-basket form. It should be hidden only when a working replacement takes over; disabling the custom builder must not remove both ways to buy.
Finish the ordinary details
Check step spacing, images beside options, clear headings and narrow-screen layout. Anything shown on mouse hover also needs a usable route on a phone.
I test those interactions with the product information actually available, including a missing image. A standard form is a starting point, not an excuse to stop thinking about the customer.
Choose the form that customers can understand and the team can maintain. If the standard capability does the job, careful layout and testing may be a better use of the budget than another custom layer.