Every no-dollar-limit manufacturer warranty we register carries maintenance conditions. In practice they require periodic inspection by an approved contractor, clear drains, documented repairs performed with compatible materials, and written notice of any rooftop alteration — new equipment curbs, satellite anchors, solar attachments, or a tenant's exhaust penetration.
When a claim is filed, the manufacturer asks for the service record first. If the roof has none, the burden shifts to the building owner to prove the failure was a material defect rather than neglect. That argument is difficult to win and expensive to have.
The second cost is physical. A ponding area or an open pitch pan takes about two hours and a few hundred dollars to correct in year six. The same defect discovered in year eleven has usually saturated the insulation beneath it, and the repair is now a section tear-off measured in thousands of square feet.