It is amusing that this year's prize in chemistry went to
three guys I've always thought of as hard-core physicists
... while the physics prize went to three hard-core
electronics / materials engineering guys.
The same body makes the final decision on both prizes (even
though the /nominations/ come from different subcommittees)
... so I assume there was some horse-trading involved.
You could perfectly well have reversed the labels on the
two prizes.
This is not the first time something like this has happened.
Marie Curie joked that the labels on her two prizes would
make at least as much sense if they were reversed.
I consider all of this to be a Good Thing. A great deal
of the world's best work fits in more than one discipline
-- or none. To say the same thing the other way: paying
attention to artificial boundaries and labels is almost
always a bad idea.