Not him, and I can't speak for every designer, but I think most modern workflow nowadays would use OpenType for best possible cross-platform compatibility, if not just for the sake of ease of output for the next guy who handles my artwork down the stream. I myself haven't touched a platform-specific font since forever, unless I absolutely need something from an old project, or I am receiving a goofy piece of work from some 18 year old undergrad freelancer.
Adobe CC, which has cross-platform usage in mind, has been quite consistent in making sure fonts are handled the same way in open-data files whichever system you run it on. InDesign and Illustrator also has so extensive OpenType support. They have gone a long way really.