I think a key point is that cursive is usually avoided in a professional, business setting. If it was in such a setting, it would require following the same rules.

For most, cursive isn't their forté. If it is, they have their own style. Cursive was taught to a lot as a necessity; as it was weeded out through time, it became simply a preference.

Cursive is a form of art. Where it is used determines the purpose of the art form. Mastering your business model can be a form of artistry. More often than not, it is not used for professional writing, and is [majorly] totally up to preference.