Possibly because they can do more than just seed worlds, and such things were just no revealed in "The Chase" as their "children" were not ready yet. Perhaps there is more to the story. Perhaps they can not only seed worlds but engineer them, or create super viruses.Yeah, I’m trying to figure out the worth/threat of this technology, unless they retcon it to be much more than it was in TNG’s “The Chase.”
The exact words the Ancient Humanoid says in “The Chase” is that they “seeded the primordial oceans of many worlds, where life was in its infancy.” If we take what she said as it is, it still took billions of years to go from Earth’s primordial ocean to humans as a sapient species.
This is a universe where they’ve had 900 years to work on the Genesis Device tech, and the Founders had the ability to genetically engineer and mass produce entire servant species hardcoded to perform specific tasks and view them as gods in the 24th century.
So why would the progenitor’s tech be a threat or be valuable beyond being a historical curiosity?
The Genesis Device might be child's play in comparison, especially since they cannot make it work, since the one person who made it work is *checks notes* dead. This might be a matter of scale.
Tune in next time for discover more baout the Progenitors. Same Trek time; same Trek channel.