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Breadcrumbs are clearly useful but I would make a distintion between two perspectives: Google: breadcrumbs are strongly recommended as part of a structured data implementation in order to get a clearer picture of our site's structure. User: breadcrumbs can a be lifesaver when site structure is so deep that main navigation is not enough. I usually skip the use of breadcrumbs for very simple structures and make it a must for complex and deep structures like ecommerce sites. For those cases in between I go for the better ux.