Rocks is a fork of Level, and Level is well known for data corruption and other bugs. They are both "run at production scale", but at least back when I worked on stuff that used Level, nobody talked publicly about all the toil spent on cleaning up and repairing Level to keep the services based on it running.
Whenever you see an advertisement like this (these posts are ads for the companies publishing them), they will not be telling you the full truth of their new stack, like the downsides or how serious they can be (if they've even discovered them yet). It's the same for tech talks by people from "big name companies". They are selling you a narrative.
RocksDB diverged from LevelDB a long time ago at this point and has had extensive work done on it by both industry and academia. It's not a toy database like LevelDB was. I can't speak to the problems they're supposedly hiding in their stack, but they are unlikely to come from RocksDB.
This is not my experience. I've been running RocksDB for 4 years on thousands of machines, each storing terabytes of data, and I haven't seen a single correctness issue caused by RocksDB.
Whenever you see an advertisement like this (these posts are ads for the companies publishing them), they will not be telling you the full truth of their new stack, like the downsides or how serious they can be (if they've even discovered them yet). It's the same for tech talks by people from "big name companies". They are selling you a narrative.