All true to an extent but in a RPG set in the movies timeframe you don't need to have Yoda, Qui-Gon or Obi (or Luke, Vader, whoever) play huge roles. You could bump into them here and there, cross paths, have some dialogue and feel like you are part of the same galactic conflict while still having main protagonists and antagonists who could get killed off or be your allies or be allies and then betray you... whatever the plot requires.
Think Jedi Academy where Luke was rebuilding the Jedi order and you were a part of that rebuilding. It still had an engaging plot.
Or SWG which also had many movie characters for side content like the rebel and imperial "themeparks". It can be done.