The history has it that the git prototype was written in about a week. If everyone is so familiar with algos and data structures nowadays why don't I see good a

The history has it that the git prototype was written in about a week. If everyone is so familiar with algos and data structures nowadays why don't I see good and novel solutions popping up here and there? Is that I'm blind? Or is it that the set of approachable impactful problems has been exhausted? Or all the innovation happens in closed source/saas space?