My explanations here can't adequately address your objections (I actually agree with your Point A, pretty much entirely), but here's my best shot at trying to at least play devil's advocate:
Your Point A: It could be that Luke felt as though continuing to participate in the fight as a Jedi would just continue the problem that he sought to stop by ending the whole Order. By leaving Leia to fight without him, it would be like an exaggerated version of when he said "I'm endangering the mission" in ROTJ. And he also left the group on Endor to fend for themselves against the Imperial troops (taking down the shield generator was already a dangerous enough mission without the help of a Jedi that it had been contextualized as "crazy" earlier in ROTJ).
If I were to poke a hole in that comparison it would be that in ROTJ he left the group on Endor not to go sit on an island doing nothing but to fight the good fight in another major area.
For Luke, exiling himself and cutting off from the Force was his answer (though a short-sighted one that Yoda corrected him about).
Force ghosts - 'More powerful than you can possibly imagine' eh? I don't know I can imagine quite a bit. So Yoda tells him that cutting himself off from the force and thereby removing himself from the equation wasn't a great idea. Yeah thanks for that Captain Hindsight. Maybe you should have popped in for a coffee with that piece of advice before 5 planets got obliterated.
Epicurus comes to mind. Was he willing but not able? Able but not willing? etc etc
Your Point B: Almost the same reasoning as above. If Luke goes in to be a Force-wielding Jedi after learning of Han's death, that would make him look like a bigger fool for changing his mind about the Jedi needing to end. If Luke didn't understand the danger Han (and others) would be facing when he decided to leave, he'd be a moron. Changing his mind because Han died would've just confirmed his lack of foresight. That moronic lack of fundamental foresight would not be a good look for Luke's character either.
I know that these rationalizations are going to be unconvincing, but that's the problem with the TFA setup for me: I think *any and all* explanations would fail to justify Luke's exile. He should've never taken himself out of the picture; it just doesn't add up. Where you and I differ most is that I thought TLJ came close enough to making it at least a plausible pro-active and selfless strategy from a pro-active and selfless character who wouldn't otherwise abandon everyone when times are about to get much worse in a hurry. But I'm in the distinct minority here, and I understand that.
I just feel that TFA and the rest of TLJ weren't good enough as movies to make me want to rationalize it in the way that you do. But that brings me back to our primary point of agreement that TFA should get most of the blame for that by being such a lazy, unimaginative rehash for a starting point.
Even Skywalker(OG)Kush's point that Luke's self-exile is no different than Obi-wan and Yoda doing the same - oh great, something else Abrams just cut and pasted from the OT.
Force powers Rian Johnson introduced:
Turn off the Force.
Talk to someone far away until you?re dead.
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