Well why the hell did Vader deserve redemption? At least Kylo had layers, some obvious conflict. The great thing about the TROS version is that Kylo’s redemption was a by-product of what was going on. Rey was on mission (both in the DS wreckage and on Exegol) and Kylo’s turn around came about as a consequence of their interactions (and Leia’s death) - not just a matter of Rey throwing everything aside to win his heart. Luke’s entire focus on DS II was saving Vader when he should have been fighting the Sith with every last breath. The idea that Luke became some kind of legend for this is absurd to me. So I absolutely prefer Kylo’s redemption over the cockamamie “Vader was really just a nice dad and you should always support your dad” thing of ROTJ.
I’ve never seen someone who hates Vader’s redemption before, so this take seems really bizarre to me. If you don’t think Vader had any conflict in the OT, did you even watch those movies? Throughout the trilogy, Vader just seems tired of being the Emperor’s lapdog. When he finds out his son is alive, that becomes his only focus. He was already in a position to be redeemed by Luke, he just needed the push of seeing the Emperor torturing his son. So I don’t think it’s some kind of “support your abusive dad” message, and I feel like the idea that Luke should be religiously focused on fighting the Sith goes against the principles of the saga. The old Jedi were wrong because they were focused on fighting the Sith, and they couldn’t see the manipulation occurring right under their noses. Luke managed to see through the darkness and redeem his father, ending the Sith once and for all.
There was nothing pre-ROTJ to indicate Vader was a conflicted soul. This is primarily because he wasn’t - Lucas hadn’t written him to be the fallen Anakin Skywalker until very late in the process. So ignoring his actions from within the Empire let’s consider Vader from Luke’s perspective - Vader’s dogged pursuit of the DS plans led to the grisly death of Uncle Owen and Aunt Beru, he tortured Leia on the DS, he killed Obi Wan right before Luke’s eyes, he shot down Luke’s comrades during the DS battle - one of whom was Luke’s boyhood friend, he tortured Luke’s friends on Bespin just to get a rise out of Luke, he beat the crap out of Luke and offered joint custody of a new fascist Empire, and finally Luke was so horrified that he attempted suicide rather than accept Vader as his dad.
I fail to see how from this we get to Luke’s “there’s still good in him” stance of ROTJ. And don’t get me started on the ethics of remaining calm while countless innocents are being annihilated by a super-laser…