There are several Sears kit homes near me. They succeeded because they offered value. I don't know about the coasts but the homes were very popular in the Midwest.
So popular that close to eighty years after they were last available it is very common to mention a property is a Sears home in real estate ads.
Amazon may have sped up their demise but Sears lost track of offering their customers value decades ago.
Amazon had close to zero role in the demise of Sears. Keep in mind, Amazon had a mere $34 billion in total sales as recently as 2010. Sears was realistically already a zombie ten years ago, long before Amazon was taking a consequential bite out of retail.
The rise of Walmart, Home Depot, Lowes, Best Buy, etc. serving the Sears customers better - as you mentioned - is entirely what killed Sears. They ultimately lost in every category to those guys, from clothes, to electronics, to home & garden. They kept doing a lot of things, and did nothing well. Any article that claims Amazon played a role in the demise of Sears, is selling click-bait.
Arguably they did a couple of things (e.g. appliances) at least competitively. But the competition in those areas definitely increased from the big box stores, department stores in general have been in significant decline, and Sears as a whole was quite a mish-mash.
It used to be that Sears house brands--Kenmore, Craftsman, etc--provided good value to the customer. Not luxury or top-of-the line, but reliable stuff that worked and was worth what you paid for it. But in recent years that hasn't really been true. But then, it's not really true for just about anyone any more. Amazon copied the Sears model--sell everything to everyone--but it has also opened the floodgates of third-party sellers selling cheap crap and counterfeit goods. It's less like the old Sears and more like an old-world medieval bazaar.
So popular that close to eighty years after they were last available it is very common to mention a property is a Sears home in real estate ads.
Amazon may have sped up their demise but Sears lost track of offering their customers value decades ago.