For all that SW is arguably one of the most important cultural products of the C20th, Lucas is a lowlife mercenary hack, as he has demonstrated time and time again. SW always had elements of darkness, and in this it stood in marked contrast to most preceding SF (or "SF" really), which was one of it's selling points. When you consider the likes of Trek and Flash Gordon, SW is pretty grim indeed: in the first movie, Luke's foster parents are murdered,
Han shot first, their spaceship is a broken down deathtrap, the Empire does indeed get to use it's terror weapon, and Luke's kindly father figure is defeated and dies.
I find it quite plausible that ROTJ was originally designed as described, and that Lucas canned it for reasons unrelated to dramatic logic. Probably it would have been better for it; ROTJ is probably the weakest of the first trilogy.
Lucas seems to have spent the rest oif his career trying to undo the things he did right, all on the basis of a spurious popularity, which reached its nadir in the prequel trilogy. I've mentioned this before but Plinkett's review of Phantom menace is thoroughly cutting:
Red Letter Media