The main benefit is credibility, plain and simple. Passing the MongoDB Certified DBA Associate exam shows a hiring manager or team lead that you understand core MongoDB admin work, not just basic queries. Things like setting up indexes, handling replication (keeping copies of data in sync across servers), and managing user access. Those are daily tasks for a real DBA, and the exam checks if you actually know them.
It also gives you a badge you can add to LinkedIn or your resume, which some recruiters do search for when filtering candidates. It won't replace real experience, but it backs it up nicely.
If anyone wants a clear look at what the exam actually covers, CertBoosters has a solid breakdown of the topics and structure: https://www.certboosters.com/mongodb/path/certified-dba-associate