Is there something in this multi-agent approach that makes the setup more specific to just the test at hand and less general to real engineering tasks? If not,

Is there something in this multi-agent approach that makes the setup more specific to just the test at hand and less general to real engineering tasks? If not, then this multi-agent system will just become what you get out of the box in a future product. Multiple attempts per problem (as long as there's no human intervention or selection between them) is a perfectly fine approach for agents because that's not an issue from the perspective of an engineer using the product. A single agent is already a multi-step usage of LLMs and it sounds like this is just another meta level of that.