pinpelipon
The thing just is... A CEO doesn't really care whether there are 1500 or 1502 workers. Some idiot drops one engine on the assembly floor breaking it. Accurate statistics is an oxymoron. The bitcoin transfers are reliable (mathematically proven even), but does it matter if your wallet shows a wrong number in the UI for a while? I had a good friend go to ATM on a Friday night and see that his current balance was 2.4 billion euros. Next morning it was corrected, and nothing really bad happened.
For the business it is more important to find the (very rare) screw-ups and correct them. You don't really have to do it in real-time either. A 1960s style batch job is just fine.
The reason for previous is that the full ACID model system will fail with the same starting values. The difference is that it tells that end user something like "uh-oh, something went wrong and we can't process your transfer or whatever" (common with banking applications) when eventually consistent model allows the process to continue, and the screw-up must be handled at later stage. From the end user's point of view the ACID version is usually much worse.
#1: Training. Oracle does training very well. If need new DBAs in-house (for security reasons etc), they got huge array of options available. The most effective options are also insanely expensive. Once paid 400k€ to get two new DBAs. They became very good at it.
#2: Clustering. Postgres is nowhere near what Oracle offers. Even with the newest releases. What Oracle offers is real multi-master synchronized replication with proper distributed locks, low latency, and it's maintainable and easy to setup. Postgres has still 5-10 years to do before they will reach feature parity on today's Oracle.
The downsides being ticks becoming common, warmer temperatures enabling more diseases spreading in both human and animal populations, a few native animals dying (they can't breed without certain things such as ice, and their natural defense mechanisms do not work), and Gulf stream probably slowing and causing a new ice age. Ah yes, there's always that. But then again, not going to happen on my lifetime so who cares... :)
Both are good on their own. The hybrid model is complex and hard to manage, even though it can technically fulfill most requirements you can think of.
It's a real shame because it means ACL usage is not going to take off anywhere soon.