You made it semantics
Again recognizing the duality of what they are (his and his fathers own innate fear, aggression, as well as the good he still saw in him), it's Luke's choice, willing-action to not let one side control him, and thus
NOT kill his father, that allowed for and showed his father
he still had choice.
So how is this moment not about free will and freedom to choose.
While challenged, that was always Lukes instinct. To allow for his father an opportunity to choose. Despite everything he had been told, Luke still followed his own instinct to see that through.
That instinct, Luke's
action and choice, willingly taking Sidious' attack, allowing Anakin the moment to make his own choice, saved his father, from being a slave, physically and spiritually.
Anakin even tells him so.
Hence Luke through his own instincts, choice and actions, not following the old Jedi, dogma, not surrendering to the Sith, brings the epic new transformative experience for himself and those he loves "The Return of the Jedi!" What Luke has learned, is aware of, he can now impart to his sister and the next gen.
In TLJ, it was Kylo. Luke ignited his metaphoric saber only in a posture of defense after his opponent had signaled combat.
So what does Disney's Luke do with that instinct, knowledge and experience of how he can save and transform others? Knowing from learned experience, that anyone can be swayed and caries a dual nature, knowing that everyone has and can make a choice if allowed, knowing that visions or prophesies are not immutable or a predestined "fate" for anyone, knowing attacking in fear feeds it, makes it stronger, ... he does the reverse of everything he learned, he surrenders to it. ...he lights his
real (nothing metaphoric about the aggression) saber in an act of fear and aggression, against Kylo who was sleeping.
Betraying all his own instinct, and everything he had learned and knew. And pushing and dooming the inexperienced Kylo to react accordingly.
This portrayal and action was such an absolute betrayal of all Luke's progress, momentum, known instinct and learned experience, it's irreconcilable as the same character, or as a forward "evolution" of the character.
It's not new, more complex, or interesting, It's actually regressive.
Unless you deny (which makes it a different character) all Luke's instincts, learned experience and choices, which not surprisingly you've been trying to do for pages now.
It's all you got, you literally have to deny what the character was aware of, had learned and become.
Hamill who plays the character knew this was a betrayal of the character, so much that in promoting the film, he was sadly uneasy about it.
I don't have a problem with you liking the sequels, (and I like all the new lead characters, I jumped out of my seat and cheered when the saber flew into Rey's hands) but if you are arguing it was some progressive forward moving take on Luke's character, I call BS.
And yes Boba is Fatt
er! yet his character is not a betrayal of where he might be at this stage in his life if he survived.