That is fantastic, I'm glad for you, however one doesn't always need the power or size of a SP4 or always have it with them.
Part of my job is social media management, I could get a query on a saturday night while I'm at a friend's place or while out doing the fast food run, chances are I won't have a tablet, but I can have a document open e.g. in Adobe, and browse it, highlight points for the query while I am looking at the query in the social media app in the opposite window. You have no idea how helpful that is, makes that part of my job very easy, I can respond quickly, make the potential customer happy and my client happy for such an accurate and well put response.
No Half-way style here