macOS only fonts support in Slide Master
Currently we can't set macOS only fonts (ex.Hiragino Gothic) in Slide Master's default one. We need to set fonts manually to all slide master objects.
John Korchok commented
Create a font theme. Here's how: http://www.brandwares.com/bestpractices/2015/10/xml-hacking-font-themes/
Agree, it is so frustrating to have to manually change font size every text time you crate a new box. Surely it it possible to add a font size next to the font style in slide master options. I note this comment was 16 month ago. Microsoft PLEASE add this feature.
Kuji Yasunori commented
We can choose Meiryo(avaiable only on windows) on windows powerpoint. Also I hope Hiragino is set as default on Mac because it's cool.