WHS: I think you have a valid point and for your worklfow the multiple devices make more sense.
My (personal) worklfow is to use 5.5" Android phone for email/web/GPS on the go, use Desktop in the office for actual work. and in the field (for inspection incl. taking pictures and sharing on sharepoint and verifying and marking up construction documents) and for meetings etc. I want to use the Surface Pro inc. the ability to remote into my PC. Laptop would be too clunky, and literally everything I need is based on x86.