I ran across a very good reason to not use canards for much of anything while researching this stuff..
Something like this:
"A canard makes good sense when you have a munition to deliver, and want to steer it while it falls. Fitting the munition and steering surfaces into existing weapon's bays almost demands something with no extra structure which can be fit the bay as it is. Two ways to do this are have a folding wing/tail assembly, or spring-loaded pop-out fins at the front and back as seen on "smart bombs" such as the GBU-10. The front fins control the glide path, and permit the standard bomb to fit in existing bomb bays on fighters.
Folding wings are used more for munitions which cruise levelly to the target area rather than are guided along what is essentially a ballistic path (Tomahawk, ALCM, etc). For anything else, a conventional configuration does the same job simpler and cheaper."
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but canards ARE neat, different, and "entertaining" trying to get them to work.
As long as the limitations are recognized, there's no reason to not play with them.