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It used to be not enough customers to pay for dark stores / warehouses when you also had regular stores available. There is a tipping point somewhere.
Supermarkets are either losing money or only just about making some on home delivery at the moment. https://www.ft.com/content/b985249c-1ca1-41a8-96b5-0adcc889d57d has some details (not paywalled for me, might not be for you if you enter that URL in a Google search). While it is a minority of your business do you want to invest all your capital building dedicated warehouses everywhere?
neu
jellybaby
That assumes supermarket orders are fulfilled from warehouses or dark stores which frequently isn't the case.