Someone once would've said that it would be complicated to travel to the moon and back.. :P
Whether MDI is good or bad, I think a GUI should support it and hand over the possible compatibility risk to the creator, as well as the subjective opinion whether MDI is good or bad. One thing to learn from creative people (and creative tools) is that there are no rules. Ten academic people can advocate why MDI is bad, but if there is a single artist who really has a purpose for MDI, does that still make MDI bad?
Whether MDI is good or bad, I think a GUI should support it and hand over the possible compatibility risk to the creator, as well as the subjective opinion whether MDI is good or bad. One thing to learn from creative people (and creative tools) is that there are no rules. Ten academic people can advocate why MDI is bad, but if there is a single artist who really has a purpose for MDI, does that still make MDI bad?