His podcast with Louie Mantia in July was pretty clear with it, though it also suggests why he’s given significant criticism of the design direction, but mostly just has quips and shade thrown at Alan Dye on the blog:
> I get to ask Alan Dye about [the shadows on Apple Watch faces]. And he was like, oh, we render a shadow? And I was like, oh, you never even looked. I just instantly realised he’d never really even looked at it. Like, somebody at Apple has, but Alan Dye didn't. […] It just suddenly came to me, oh, he doesn't do the job I thought he did.
> I get to ask Alan Dye about [the shadows on Apple Watch faces]. And he was like, oh, we render a shadow? And I was like, oh, you never even looked. I just instantly realised he’d never really even looked at it. Like, somebody at Apple has, but Alan Dye didn't. […] It just suddenly came to me, oh, he doesn't do the job I thought he did.