When a company is on an exponential growth trajectory it's easy to get unfocussed and try and do a lot of different things assuming the "Midas Touch" applies. That rarely happens and companies lose track of what their mission is. Aldi didn't at any point in time and that's pretty remarkable.
My takeaways - have clear, well-defined, easy to understand goals, drive decentralization and keep the customer at the center of every decision - not the vendor, the brand or the employees.