One way to look at it is like this: Previously, to increase performance of a production Java app you would pay the best Java developer you could find a lot of money to make it run fast.

Now, you might still do that, but first you will pay Oracle some licence fee so you can use their commercial JVM options (and good Java developers are likely to insist on using those feature because generally JVM tuning options work very well). That take money out of the budget for Java talent.