[CMake] Interface Libraries allow include directories but not link directories.. Why?

[Brian Davis]

Why does:

Interface Libraries
https://cmake.org/cmake/help/latest/command/add_library.html?highlight=add_library#id3

allow include directories via

target_include_directories(INTERFACE)

but not link_directories

https://cmake.org/cmake/help/latest/prop_dir/LINK_DIRECTORIES.html?highlight=link_directories

which if we look at property scope:

https://cmake.org/cmake/help/latest/manual/cmake-properties.7.html

Why is include_directories at target resolution while link_directories is
at directory resolution.

link_directories is a property on a directory which if I recalled correctly
I complained about many many moons ago (circa 2009) when I first realized
this.  I did not understand this logic then and don't understand this logic
now.  Someone what to give me the recipe for the CMake cool-aid so I can
mix that up, drink it down, and re-read the doc and finally come to terms
with this.  Or could the powers that be redesign CMake to make sense.  At
the time I wrapped this nonsense in a macro and pretended it did not happen
... now I am rewriting my project for "new" CMake and still don't get this.
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