No, but I believe in clarity. The use of figures (or ampersands - &) doesn't make text clearer and therefore easier to read. The use of figures actually slows reading and comprehension.
Even in text, figures are only used when appropriate. There are styles commonly adopted in publishing. For example, one would write the words for 1 to 10 but, above that, one uses the numbers, e.g., one million but 20 million.
Over the years, when I've been editor of various club mags, I had to use global search and replace on many submissions as the writer(s) persisted in using "&" instead of "and".
It is not clearer and the ampersand should only be used in certain circumstances. See
All about ampersands