People should mostly avoid it otherwise, IMO. There are plenty of better alternatives for typesetting pretty mathematics.
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More generally about the thread here, TeX is not a productive or effective tool for making business cards or other heavily graphical documents. The point of TeX is to handle standard typesetting of structured prose and mathematical notation. Any time you need flexible layout control, TeX turns into more trouble than it’s worth.
Someone using a dedicated graphical page layout or vector graphics tool is going to make a better business card (or poster, or flyer, or diagram, or ...) in less time, in a way which is much easier to modify later.