The revised core books for Dungeons & Dragons have been a mixed bag, but the new Dungeon Master’s Guide is certainly more useful for DMs who are learning the craft, as it focuses more on creating homebrew campaigns instead of campaign worlds. In 2014 the DMG put far too much focus on world-building. This preoccupation was harmful to newcomers, as starting DMs look to the DMG as what it purports to be: a guide on how to run the game of D&D. New DMs should absolutely be creating bespoke campaigns, but not original worlds for them to take place in.

https://screenrant.com/dnd-dms-homebrew-campaigns-not-worlds-op-ed/