The method ProductSearchModel().getProductSearchHits() is efficient and scalable because it utilizes the product search index rather than conducting a direct search within the database. This indexing method enables quicker retrieval of product information and is optimized for performance in scenarios where multiple products need to be fetched based on various criteria. Using the product search index means that data retrieval is managed through indexed fields, which is significantly faster than querying a database directly for each request. This approach not only improves performance but also reduces the load on the database, making it a scalable solution for e-commerce environments where high traffic and large product catalogs are common.