From what I see the problem is that the newer Macbooks are slimmer and have less efficient thermals. So the processors are more efficient, but the benefit gets

From what I see the problem is that the newer Macbooks are slimmer and have less efficient thermals. So the processors are more efficient, but the benefit gets lost by shipping them in smaller enclosures and on top of that smaller batteries. I'd love to see the new processors and RAM in a 2015 enclosure. Makes me wonder whether someone has attempted to hack it together.