Yes, but my point, which I may have failed to express well, was that in the real world, you can't realistically expect to be able to situate a pickup in anything approaching a precise relation to any given node or antinode. If you only played open strings, sure, but not if you really play the guitar. The range of possible notes you can play on a string is so great that you can't really say a pickup is at or even very close to a particular major node or antinode a large percentage of the time. So I don't think a PU's proximity to any particular node is of much importance. You can, however, say that for most of the notes you would play on a string, a PU placed, say, 1" from the bridge will be closer to one end of the vibrating length of the string (where the amplitude of the vibration is less) than a PU placed 3" from the bridge, which will then be closer to the middle of the vibrating length (where the amplitude of the vibration is greater). This has a noticeable general effect on tone, but it doesn't AFAICS depend on proximity of the PU to any specific node or antinode.