I've watched that extension's development since it was little more than one smart guy's wish list. I don't think its fair to say that they copied any one archi

I've watched that extension's development since it was little more than one smart guy's wish list. I don't think its fair to say that they copied any one architecture. The authors have put in a ton of time researching the tradeoffs and investigating the trade space over the years. That said, until it gets ratified by the consortium and implemented in silicon its still just a (well-researched) wishlist.