That works for forms. I write static content.
I did start adding little calculators and utilities in my articles, but those only make sense because I have a lot of free time.
I heavily cite sources, so at least you'd know the exact paragraph in the law that supports it. It's something my competitors neglect, and it makes it hard to tell facts apart from hearsay.
FWIW in UK 'must' in gov advice indicates a legal obligation. It annoys me no end when such obligations are not supported by references to legislation: as then I can't check if they've been correctly interpreted.
Prose should be readable, but also functional.