As an extreme example it actually brought me a bit of hope. No source code was released but the "peer review" via arXiv, Twitter, and other various channels end

As an extreme example it actually brought me a bit of hope. No source code was released but the "peer review" via arXiv, Twitter, and other various channels ended up bringing the story to a close. I'd like to imagine it's how effective peer review could be if given sufficient motivation ;) As you note, though, most papers don't get anywhere in the same magnitude of focus, and others which do may still be entirely unreproducible anyway :(