Relatedly, today I noticed warnings for missing comments on non-public elements with javadoc16 that did not appear in javadoc11.
CompletableFuture.java:1718: warning: no comment static final class AsyncSupply<T> extends ForkJoinTask<Void> ^ Naturally I added the flag -Xdoclint:all,-missing BUT I'd like to be able to control which access levels require javadoc comments. Few style guides will want to require javadoc comments on private elements.