I don't think OP's question is the same as the one asked about Dropbox. The Dropbox question was about why the service was needed at all when you could use Unix tools like rsync to achieve the same thing. The answer to that was simple: not everyone is a tech-savvy user who wants to mess with command lines. On the other hand, OP's question was about whether there's already a mainstream database and extension that does what Roe AI does. They got a response, and it was helpful. The "You can do this with rsync!" argument became a meme, but now it's almost overshadowed by the knee-jerk "That's what they said about Dropbox!" response.
Indeed, it is a big factor of survivorship bias. The refrain against Dropbox is notable because Dropbox is the exception, being successful, not the norm. People don't realize how many startups have failed where people echoed the same old HN comment regarding these startups as having been said about Dropbox too.
it's the same as the quote we keep hearing "every big new thing started out looking like a toy". Somehow a bunch of people who should know better (intentionally?) misinterpreted that as every new toy is the next big thing.