For that to work with paid fonts DRM would likely be involved though, and more DRM is never a good thing. Doubly so if app vendors aren't happy using the OS pro

For that to work with paid fonts DRM would likely be involved though, and more DRM is never a good thing. Doubly so if app vendors aren't happy using the OS provided facilities, instead wanting users to use their own, and decide to embed said DRM in your personal documents. There are also situations where fonts might be needed while offline, which despite the seemingly ubiquitous nature internet connections today is more common than one might think. It'd also mean forced decommissioning of the various ancient machines still hanging around in places like print shops that handle newly made TrueType fonts just fine.