The earlier editions of Surface were never capable of being a laptop replacement.
The reviews I've read suggest this edition isn't either.
A device that doesn’t allow one to run apps and services that one runs comfortably on the laptop can’t replace the laptop
As a consumer, my Android can do anything my desktop can. As a professional, I have work utilities that don't run on Android, but I don't use my laptop for those anyway; I use a VM over a VPN (which my Android could connect to).
The reason my tablet can't replace my laptop is the keyboard and screen size. Mostly the keyboard. Windows 8 doesn't change that. Reviews say the Surface 3 keyboard isn't any better than any other tablet keyboard.
Now, if Microsoft released a mechanical tablet keyboard, I'd buy it the day it came out. I'd put Linux on it, but I'd buy it.