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And above all because there are too many choices that are too specific, outdated and too exotic.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.
And above all because there are too many choices that are too specific, outdated and too exotic.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.