Research funders specify grant applications written in 11 point font because Small type size makes it difficult for reviewers to read the proposal. Yes, as I age, I find small type more difficult. But I can read it on screen and increase the size!
These same funders also specify a sans serif font. Personally I hate hate hate reading large wodges of sans serif text, finding it harder on the eye than a serif face.
Why not just specify a word limit, and some form of markup, so that the reviewer can reformat the document to their own reading tastes? (And then print it out, if that's what they want to do.) I do believe this is the 21st century, after all.