Giant planets (gas giants) mean there is a considerable reserve of elements, and both light and heavy elements are present in significant proportions, which also lays the groundwork for development.
For foresighted observers, they would quietly mark the Solar System in their database. If they planned to colonize other star systems or establish stations like transfer hubs in the future, the Solar System would be worth an extra look.
Just an extra look, because the Solar System is located on the edge of the Milky Way Galaxy and, like it, there are countless star systems. Distant observers didn't have much reason to pay more attention.
The scale of the Milky Way Galaxy reached an astonishing 100,000 x 100,000 light-years, with four arms each about 4,500 light-years apart and housing hundreds of billions of stars.
Assuming one hundredth of a percent of these systems could support life, that would still be tens of millions.
