I second this. It's too risky and simply not worth it. Nevertheless, I find this "optional ACID" thing interesting. Many years ago when I was a graduate student, NoSQL was a big thing. It was widely claimed that transactions were expensive and you had to drop them in exchange to scale. I always had this question that if transactions were the culprit, why not turning them off? I later found that the relational system is such a monolith that everything (caching, concurrency control, logging, locking) is wired together in an extremely complex way and there is simply no "turning off".
Redis simply serializes every operation, I thought. Transaction = run a Lua script as a single operation. I think that is ACID, if you count RAM as "durable" and doing one thing at a time as "concurrent".
Yeah, I think they were talking about distributed transactions, Redis only support transaction in a single instance, not in a cluster. You can not run Lua across machines.