Are there that many people managing their dns by hand that they need this? Outside of various txt records, most of my domains are mapped to specific resources via automation.
Both DNS and S3 or any filesystem really... they're just key/value stores.
DNS also has considerably higher reliability and compatibility than almost anything else
But "automation" with this could legitimately (well, mostly) be based on a git repo with an s3files mount inside it. And a cron job, if you really want to get fancy.
How many thousands or millions of employees does your org have? And how many projects deployed over the decades?