I agree that there isn't actually that much synergy in the work to be done with Variable Fonts. But VF is something that has attention and mind share and might easily get funded. Dealing with both under a single umbrella would be a strategic move to try to get the general feature UI funded and paid attention to. (Probably not something I should say publicly, oh well.)peter sikking said:
I would be very happy to also design vari-font reference UI. I do not see so much overlap/synergy with the discretionary OpenType features so it makes the design project simply longer. not twice as long, because vari-fonts is not as complex as OT features.