Slots take up space, panels take up space. It wouldn't be the same size as before, I imagine those two things would add depth more so than width or length.

Well, this is getting very technical, which is why this whole discussion was basically moot from the get-go. The reasons why they use glue instead of straps or clamps, why they use Pentalobe instead of Phillips are not entirely transparent, but they smell a lot like planned obsolescence—or at least neglected durability. They might be already the cleanest, but they are certainly on the throw-away bandwagon. Don't get me started on their cheap white rubber cable coating and the fact that the 1st generation iPad is completely unsupported just 4 years after it was discontinued. Quite frankly, the degree of Apple worshipping on HN and that I receive plenty of downvotes for my SSD-upgrade anecdote sicken me.