I think people forget the biggest difference in how Jensen acts toward Supernatural compared to Jared is that Jared got a complete story arc for his character, as shitty as that ending may have been for him. Sam retired from the hunter life, had a wife and a family, and grew old in peace and relative happiness. Dean died with his storyline unfinished. 15x18 clearly set him up to respond to Castiel's confession, and he wasn't able to. Dean dies on a hunt young, miserable, and alone - exactly how he thought he'd go out when he was 26. That's not a satisfying conclusion; it's a slap in the face. And Jensen knows that. That's why he can't let Supernatural go; it's not finished for him yet.
The last two weeks of July are going to be absolutely batshit insane on here. Barbie/Oppenheimer double feature, 2 Good 2 Omens, the Witcher finale all in a span of less than eight days? The only thing that could possibly make things worse is another category 3 supernatural event