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Idea/PyCharm/etc say they work better with Oracle JDK but I haven't noticed any difference so there seems to be little reason to install Oracle JDK ever. Perhaps it has some features some devs use in some special cases but in general, the Open JDK seems working equally well.

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That was in the past, now JetBrains's tools preferred their own, forked OpenJDK

https://github.com/JetBrains/jdk8u

Why? How is it better than the original OpenJDK? There seems to be no answer to this question in the repository readme.

Before Oracle synchronized all the code between the proprietary version and OpenJDK, stuff like the graphics engine and font rendering wasn't the same.

So many applications, including JetBrains ones, did not look that good on FOSS/OS X platforms with many rendering issues.

Hence why JetBrains started bundling their own version of OpenJDK for those not willing to install Oracle JDK.

But why would one need their own version of OpenJDK today?

I ran into this just the other day, Autopsy, a digital forensics application ( https://www.sleuthkit.org/autopsy/ ), requires Oracle JRE and wouldn't even start with OpenJDK when I tried it.

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