Morkus from Orkus
The DMG literally tells us what the core assumptions(defaults) are that the game world(generic setting) is based on. Once you start altering those core assumptions for your setting OR if you use a premade setting, you leave the realm of defaults in whole or in part. The DMG even uses the word default several times for various sections.Which is the way it should be. Any attempt to glean a "default" setting from the pages of the core rulebooks is a waste of precious internet time. Which is not what the OP has done, but a sidetrack that often enters these types of discussions.