Not only that, having a start point for settings like eberron did with wayfinders gives the community a startpoint to build off of. Prior to wayfinders there were multiple people trying to build enough foundational stuff to run eberron games in 5e & not all of them were compatible. After wayfinders & rising those projects shifted to extending the base in ways that were more compatible.Opening stuff up to dmsguild is huge - it means people can write conversions of old adventures in a setting without WOTC having to put their tiny team on it. Sure, an individual DM can do the work, but the success of the dmsguild proves plenty would rather pay for someone else to.
I've seen multiple attempts at building 5e darksun & wouldn't be surprised if other settings had similar too.