I mean... I know this forum in general is primarily concerned with discussion of the storylines and so on, but it's fair to want to discuss the art as well, as in-depth as anyone wants. Comics are a visual medium after all. I'd certainly rather talk about it than power-scaling debates for the zillionth time.
I don't mind artists having their own unique styles at all. Dragon Ball is already incredibly stylised. I think it's perfectly valid to criticise anatomy when these character designs are meant to be very articulated and internally consistent, though. I guess I can sympathise with Toyotaro to an extent because there's a built-in standard for him to live up to that he's only allowed to branch out from in minor ways. The neck-and-shoulders thing is one slightly ugly manifestation of his own sensibilities creeping out. On paper, that's good! But I'd honestly like to see Toyotaro's art style branch out even further, hopefully so that he can one day leave the overused, uncomfortable-looking hunchback poses behind.
The way Toriyama personally corrects certain pieces of Toyotaro's art is quite fascinating. For instance, the difference in the way that he drew Zamasu compared to Toyotaro in that one panel is staggering. Toyotaro was clearly in "drawing Shin" mode in the above picture -- he later noted he was still coming to grips with the idea of a dark Kaioshin. So his Zamasu initially just looks like a weird, bug-eyed Shin, like he was still trying to follow Toriyama's reference images. Toriyama's Zamasu, below, actually looks cold, steely and mean.
Toriyama undeniably has the experience and the magic touch that Toyotaro just doesn't have... yet. There's always time. But like I said, I'd like to see him practice and refine his own style more, and maybe do some non-Dragon Ball material in the future.
With Frank Miller, I'll still moan about his increasingly terrible art till the sun rises anyway.