Speaking of Yegge and Amazon: http://steve-yegge.blogspot.com/2011/07/ebay-patents-10-clic...
Amazon has continued to grow in simplicity and coverage, including ease of purchase with third-parties (eBay's dealer market). Meanwhile, buying on eBay is still a huge pain, with no integration between eBay and its own subsidiary.
I /hate/ going with hires who are "good enough." The nightmare employee is someone who is not quite bad enough to get fired.
Once you obtain certain scale, you can't do everything. It's equally ignorant to think an engineer can run a business top to bottom as it is to think an MBA can fully run an engineering company.
I so often read here MBA used pejoratively, but remember that most small businesses fail because they're run by people who have skills but no idea how to run a business. A major corporation needs both (and more!) skills.
Lou Gerstner and Meg Whitman are two examples from the technology world. Both came into their jobs at IBM and eBay with zero tech experience, but got up to speed very quickly. Of course, had they failed to do so they would have been out within a year or two.