Right now BoofCV generates Java 8 byte code. This is a bit annoying and requires a few hacks to get it to work and use Java 14 syntax. The main driver for targeting Java 8 was Android. It sounds like you can now use Java 11 libraries in Android so BoofCV could be updated. This change would occur at the earliest at the end of this year. If this would cause problems now is the time to let it be known!
"Now, now my good man, this is no time for making enemies." — Voltaire (1694-1778), on his deathbed in response to a priest asking that he renounce Satan.