For me, I usually separate the facts as presented in the OT to the prequels.
Ignoring episodes I-III, it comes across, again to me, that Darth Vader never finished his Jedi training.
For Luke who trained with Ben, an accomplished Jedi Knight, and Yoda who’s kind of a Jedi master/yogi/priest type, it seems like part of the whole Jedi thing. Becoming one with the Force in spirit as well as body.
It just furthers the point of how sloppily Lucas was in preparation for making the prequels. I.e. not watching the original movies before writing the new films, not writing a script until well into pre-production, insisting on including Anakin as a child despite Spielberg begging him not to.
