[avianes]

Well, first of all, because it shows no results after +10 years. There is definitely no indication that it will work someday.

And above all because there are too many choices that are too specific, outdated and too exotic. (e.g. the split-stream encoding is way too exotic)

I work in a small company that makes processors, and I know from experience that developing a processor is a very complicated subject, you have to go step by step (Mill does not). When you come up with a new design/idea, you try to simulate it, test it and implement it. You don't pile up new ideas without getting feedback on them.