Each of those third-tier LTS point releases represents bug fixes of various kinds and (hopefully) not regressions. Update if you have bugs you need fixed. If the latest 2019.4.x release doesn’t fix your bug, then report one clearly and it will (hopefully) get fixed in a future x release.
I just upgraded. Smooth transition. Everything is Perfect. NO jdk sdk ndk error. All good from my end.
I had installed unity 2019.3.0 editor( not from hub). and installed hub later. which caused all sorts of problems.
then I uninstalled everything. downloaded and installed hub then from hub installed unity 2019.4.4f (LTS).
in the options only selected ios build, android build and not vsstudio as i already have vs2019.
worked like a charm.