Apple CEO, Tim Cook said, "There is a disadvantage to a fusion of Mac and iPad".
Reason is that according to the CEO, published on 9to5mac, Mac and iPad are separate products, if you combine two, it will erase one side or each other's advantages. And as a result, it will create a tradeoff and compromise.
Do not want to work on a MacBook that you can easily carry around like an iPad, but you can not rely on a keyboard, and on the other hand, you can do it like a MacBook but you do not want to put a heavy iPad on the bedside.
According to Bloomberg 's report, Apple is promoting a project called "Marzipan" that runs iOS applications on Mac, and this function will be released in 2018.
In recent years macOS applications were less convinced by their number and quality, so this plan will be positive for the macOS platform.