How can we apply custom fonts to Communications Sites (and other of the new emerging site types)?
According to this overview we would have to apply a composed look. But this composed look is bound to a master page. Furthermore the theming engine is called "SharePoint 2013 Theming Engine" which sounds like this is old stuff.
Is this ok to use composed looks in a modern context to change the fonts? If not: what are the alternatives in a modern context?