I think you're probably right. It's actually made me want to compare the water flow between the original plate and this one, both with the shower screen taken off. I wouldn't mind betting both of them 'squirt' 4 jets to some degree (causing channelling) and could be improved on.
In my mind, I'd imagine you'd get the same channelling when grinding a bit coarser too, just not as obviously visible in the puck. What do you think?