I don't think Yoda needs to be seen again after Luke departs to save his friends.

Yoda's final scene in EsB as it stands is awesome as is. He watches Luke take off and says his famous line "no there is another"......we don't see him again until ROTJ.

Why break up that perfection with an abrupt reaction shot at some point toward the end of EsB when the story has already moved forward? It's not necessary.

There's no need to tie up every little detail and loose end, that's what GL tried to do with the PT and what many criticize him for.