I've done whiteboard only interviews, as well as shared doc/coderpad only, and I find both limiting. When thinking about the problem, it's great to have a whiteboard to sketch examples etc, but writing code is much easier with a text editor.
Recently I interviewed at Google, and they had no problem fulfilling my request to do both: sketch the solution approach on whiteboard and then write the code with a laptop.
Recently I interviewed at Google, and they had no problem fulfilling my request to do both: sketch the solution approach on whiteboard and then write the code with a laptop.