My kid hates Linux (ZDNet)

> It's not only proprietary bits for which 32bit compat is useful. There is unfortunately
enough free code still around which is not 64bit clean for various reasons. While it could be
cleaned up it is often a lot of work.

64-bit unclean code tends to happen when the programmer freely interchanged ints and pointers,
or was using on-disk/on-network data structures without fixed-width sizes.

I don't deny that this buggy code exists, but at least in the F/OSS world there's not much of
it left.  However, in the "internal company software" world, this is probably more common than
not (going on my personal experience).