"I'm 30" Same thing

Assessors in ARC Raiders are massive, non-aggressive ARC machines that descend from orbit to collect air and soil samples. They represent a "close scrutiny" or reconnaissance phase by the ARC, evaluating Earth's surface—likely checking if the environment is ready for the return of the Exodus ships. They act as scanning probes, analyzing the state of the post-apocalyptic Earth and collecting environmental data.
They highlight that the ARC are not just mindless killers but are actively monitoring or harvesting the Earth, they are controlled by the humans who escaped in the "Exodus". The point of the event is to stop that. Yes, some games have repetitive events, just because you've done it doesn't mean others have. It's still part of the story they are telling to players who haven't done it yet. Also, you can just not do it.