The home improvement chains hurt them too, once they started selling tools and appliances.
We bought everything at Sears in the 80's. Electronics (including computers), appliances, toys, clothes, tools, lawn and garden...
Was Sears too 'friendly' with their suppliers? When I worked at Sears at the end of the 1990's (the store was a ghost town then), many of the long-time employees were making pretty decent money. Way more than people at Best Buy, Target or Walmart made. Plus actual benefits. The must have had huge legacy costs, especially at the higher levels.