Part of it also comes from the tendency of large orgs to ship their org structure. It can oftentimes be worthwhile to have individual teams each fully "own" a

Part of it also comes from the tendency of large orgs to ship their org structure. It can oftentimes be worthwhile to have individual teams each fully "own" a piece of the product, and that also comes with the autonomy to choose to duplicate stuff that other teams might have already built rather than working with them and tweaking it to match their own specific new requirement. This significantly reduces communication & coordination overhead for delivering new features, at the expense of consistency and code reuse, which can often be a worthwhile tradeoff at scale.