I don’t think that’s the case. As Watt has said in his diary, he’s playing what J tells him to play. This is just how J wants the bass to be played, I guess. So don’t blame Watt for the bass parts that J has written.
Plus, Watt had to learn as they went along, because the band took hardly any time to practice before they started the first tour. You got to give him some credit for doing as well as he did last year. And when I saw them in March, they were tight as hell.