Oracle is quite clever in some ways, perverse in others and overcomplicated in more.
It may well do some things very well, and a RAC cluster does a good job of HA if you need it that good but it takes expensive people to look after it properly. And in all the ways that you could argue that Oracle is better than PostgresSQL, if PG is more than good enough for your requirements, paying eye-watering amounts of cash out for stuff you don't need doesn't make sense.
I've seen dozens of Oracle instances being used where there are more appropriate and far less expensive options.
Biting the hand that feeds IT
