It's not that it's not worthy of discussion, it's that there's more being read into it than there really is. People discuss all kinds of things like the latest fashion trends that appear in the news and articles and all kinds of places, and many of those things are nevertheless fairly inconsequential and don't mean something more than what they are--it's not that they aren't worthy of discussion, just that they don't necessarily mean something more.
I think that's fair to say. And if you're just looking at just the battery pack, then I think your comment rings more true.
But I think a few people are seeing it as part of something more. At least I am. It's not just the battery pack. For me, it extends all the way to the iPhone 6. And it becomes an even larger talking point when people like i7guy makes an excuse for the Apple magic mouse's design, but fails to play by his own rules when it comes to the Samsung Note 5's design.
This is perhap why this conversation feels bigger than it seems. But it's also not entirely small regardless. Apple is the leader in design. A few -- some might argue even one -- foul up in design taints that prestige they hold. If this was any other case maker, it wouldn't be making frontpage news. This is Apple. And if we're going to call them industry leader in design and innovation, we have to hold them up to that standard. If we don't, well, then we get more battery case designs like that.
I've argued many times before on this topic... we can't keep giving Apple passes. And it's those certain fans that always do. And we have to call them out when we see it. I said this would be detrimental; those fans are the worse kind of fans. It allows for Apple to get away with designs like this, and then sell them by the truckload, absolving them of any responsibility in design. Yet they still want to be called the leader?
(This is slightly off topic, but it's similar to what I've argued in the past... That if Apple really is the industry leader, why are people shocked or upset when others follow their lead. If they're the leader, we have to treat them as such, scrutinize them as such, and stop being shocked when others follow).
Anyway... like I said. Even Tim Cook has to field the question about the battery pack design. This isn't small potatoes. It's worthy of discussion, as you agree. Within that discussion includes whether this is a sign of a larger problem with Apple design or not.