Are replacement windows really Maintenance Free?

Maintenance Free? .. replacement window hype

What about the replacement window hype of being so much more Maintenance Free?  Replacement windows are not maintenance free, though they may be easier to clean. This maintenance-free claim is most often used with companies that sell vinyl and aluminum windows. These windows simply cannot be maintained nor repaired. Traditional wood windows are composed of interlocking parts made from natural materials, and any part can be repaired or replaced. Vinyl, aluminum, fiberglass, and composite windows are manufactured as a unit and the components cannot be repaired. When a part fails, or the insulated glass seal breaks, or the vinyl warps, the entire unit must be replaced.