1. Apple distributes source to the LGPL pieces, so that is not an issue for them.
2. The rest of what you said doesn't make much sense to me. I'm not clear on what distinction you are trying to make.
There are those that believe that the question of linking is mostly irrelevant to whether something is a derivative work. Lawrence Rosen is the canonical example of folks in this camp. But even in that camp, static linking may be a problem, it just depends on what is being done.
So it's not really true that "static linking isn't a problem".
2. The rest of what you said doesn't make much sense to me. I'm not clear on what distinction you are trying to make.
There are those that believe that the question of linking is mostly irrelevant to whether something is a derivative work. Lawrence Rosen is the canonical example of folks in this camp. But even in that camp, static linking may be a problem, it just depends on what is being done.
So it's not really true that "static linking isn't a problem".