I was looking into how WFN font works lately, and it appears that SCI font has very similar format. WFN is like SCI just with data saved in different order. It will take close to no time to add SCI fonts support to AGS, so that they could be used without preliminary conversion. Engine and editor will bring them both to same internal type on load, so there will be zero difference in how they work.
May this be useful?
What could have been CJ's reason not to do this and use WFN instead? Could that be legal issues?
It's nice to have, but there's also several tools out there that easily convert a SCI font to a WFN font.
(several years ago, the only way to deal with SCI fonts was to install the buggy-and-unsupported SCI Studio, but thankfully there's alternatives now)