Legalism in my eyes is seeing these laws as sanctification. But God says even here that it's not adherence to the laws or anything else that sanctifies them. Also looked up sanctify for reference, I believe this is the definition applicable here. "freed from sin"

I noticed that animals not meeting the criteria would not be accepted. I wonder what this means exactly? If someone is make an offering of Thanksgiving, that's not accepted... hmm. I wonder how many meal prayers I've said without really thinking about them.