I get what you’re coming from but I don’t think they’re the worst ideas, personally.
I felt the Jedi of the prequels were based off Buddhist monks who grow up in the temple and follow of a doctrine of non-attachment. George creating the flaws of this mindset were intentional, and the Jedi fearing attachment was meant to be their downfall.
Pop Culture Detective’s video The Case Against The Jedi Order highlights the problems you mention, but also comes to the conclusion that it was a mistake on Lucas’ part to portray them this way. But like I said, I believe portraying them this way was the point. Maybe the Jedi weren’t always this way, but after countless wars against Sith and fallen Jedi, the Order eventually became more dogmatic in an attempt to avoid that cycle.
Regarding the Force, I think it really depends on your interpretation. If the Force is meant to be taken as a form of religious belief, then the Jedi’s power stems purely from faith, believing in the Force. For Luke in ESB, the idea that he could lift his lightsaber from the snow, or a rock from the ground, is more believable than lifting a large ship from a swamp. Like Yoda says, size matters not. But of course, believing in yourself, or the Force, is still easier said than done, and this ability to let go of control is what separates a student from a master.
Really, the belief in lifting a ship is an extension of Luke believing he could make that impossible shot when destroying the Death Star. He let go and put his faith in the Force, and he did it.
All power in the Force stems from one’s belief that the Force can do anything, and letting go of one’s own preconceptions of what they, and the Force, are capable of. I think the simplicity in this message regarding the Force, which is faith and the power of belief, is what makes Star Wars so universal.
EDIT: Since this is a worse ideas thread I’ll throw out one or two.
I think Jar Jar Binks was one of George’s worst ideas, or at least the execution of it.
I also think Starkiller Base was a totally unnecessary idea. I can live with it but if I could change it I would.