I don't think anyone in this thread has suggested that Apple is infallible.
Rather, they are iterating upon the same few products with a zillion engineers in eensy weensy form factors where space is at a premium, so they probably think about why they do things a certain way.
And yet, their phones still have more than enough space for 4 screws, as you would see if you opened an iPhone. Actually, just reusing existing screw holes could do it.
There is a good reason, and the reason is that Apple doesn't want people to easily repair their phones.
Rather, they are iterating upon the same few products with a zillion engineers in eensy weensy form factors where space is at a premium, so they probably think about why they do things a certain way.