I, too, would prefer waiting for InlineArray to be introduced to the language and only once we have a better understanding of it’s use decide whether a shorthand syntax is needed, and if so, how that syntax should look like.
There is still too much uncertainty how important multidimensional inline arrays are goring to be, for example. Or how common the variable x is for the array size. Or which domains will adopt the inline arrays most and what existing syntax they might be most familiar with.
I am not opposed to having a shorthand syntax, but for now, choosing among a set of (to me) bad options just so we’ve picked one feels premature.