This issue is that it takes time and effort by good people to get there. No one prevents you from writing fast queries at BigCo. Mostly they end up being slow b

This issue is that it takes time and effort by good people to get there. No one prevents you from writing fast queries at BigCo. Mostly they end up being slow because the person writing them doesn't know any better, and there is no motivation by BigCo. to push back and have the developer spend time learning optimizations. Nothing is free. Developers with more skills tend to cost more. BigCo. probably has some, but they are probably tasked with something else that BigCo. finds of greater value.