Great reference Captainbob!
jaimee - both raw and cooked kale should be included in your diet, however just like with all foods, rotating your greens and a wide variety are key!
Kale does have large amounts of vitamin K, however if you are not taking a blood thinner, then this is actually a great benefit of leafy greens.
Oxalates are naturally occurring in certain foods with spinach being one of the higher leafy greens. If you are not prone to calcium oxalate kidney stones then this isn't something I would worry about as long as you are eating a reasonable portion (most people do not overdo it on the kale!!) and again, rotating your greens!
Goitrogens are important to consider if you are suffering from a thyroid condition, otherwise this should not be a concern.
Cooking has been said to reduce oxalates and goitrogens.
Since each of us are unique this blanket statement from this article may be confusing and may not be relevant for you. As far as "digestive health" goes - if you are finding them hard to digest, then there may be some other things you can do to help your body utilize this great ingredients - (digestive enzymes, cooking it, probiotics, other food intolerances affecting your digestion, etc.)
Hopefully that helps you sort out the info!