- the minor interaction with surroundings we see in ROTJ don’t matter near as much as finding out that force ghost Obiwan and Yoda maybe could have appeared before the Emperor and Vader and zapped them.
But Yoda didn’t just zap the tree out of thin air like the force lighting the Emperor uses. This has already been explained to you.
Whatever you want to call it, it sure would have been nice if had used it on the Emperor in ROTJ after Yoda died. Heck, why didn’t Yoda and Obiwan just kill themselve after the events of ROTS and use this whatever-you-want-to-call-it power on the Emperor and Vader and end the whole thing right then and there? Sure they’d be dead, but surely Yoda and Obiwan would have no problem sacrificing themselves if it would save the galaxy.