Mathworks will never be switching to Java 11.
Mathworks is engaged in a multi-year process of getting rid of Java for their tools and toolboxes.
The whole uifigure / App Designer exists to get rid of Java.
Why is MATLAB not doing minimal updates to keep current while still proceeding with conversion efforts? It is because every version after the current version requires that end users pay Oracle a per-desktop license fee.
... No, I do not mean a per-user license fee, I do mean a per-desktop license fee. Each virtual machine must be licensed separately, no matter how long the virtual machine lasts. Also, as the language of the license is not specific about what a "desktop" is, it could certainly be interpreted that if you use the MS Windows "switch desktop" feature or the MacOS multiple-desktop feature, that you must license Java for each one of those views.
Historically Oracle only charged fees for the Developer version, but they switch to charging end users as well. And they have a reputation for being litigation-happy.
