You don't have to think of it in terms of accumulating more skill points. For me, the appeal of NG+ is replaying the entire storyline in aesthetically pleasing armor, equipped with great-looking swords, and being able to concentrate fully on the story instead of obsessing over gaining levels so I can finally equip decent gear. I won't have to worry about the game ending two hours after I've acquired my mastercrafted armor. I can get entire playthroughs of enjoyment out of my gear now, instead of getting excited over a sword whose level requirement means I can only use it for the last two missions, or a new set of armor that looks great but can only be used to look good playing Gwent because the story ended an hour after I was finally able to equip it.
I respect that you have no interest in NG+, but there are many reasons to enjoy the feature, and not all of them have to do with maxing out skill points.