Many if not most ecom sites will be using a vendor for search (e.g. Bloomreach) so they're sending a feed of product data to their vendor, just a subset of thei

Many if not most ecom sites will be using a vendor for search (e.g. Bloomreach) so they're sending a feed of product data to their vendor, just a subset of their product data (which may not have enough metadata for some facets people might reasonably expect). That means there's lag, and also that the integration is stiff and brittle, hard to change without time and money. Even then, whether they're rolling their own search or using a 3rd party, nine times out of ten their search will be ONLY for products, good luck if you wanted to search for a phrase from their privacy policy; for that or any sort of other non-product content you're forced to use Google/Bing/ddg etc.