Who wants even more hardware to add to their laptop? I realize that you might need a DVI to HDMI adapter but I wonder how easy it is to find adapters for DisplayPorts or docking stations. Ebay?
I know Thinkpads have a good reputation and probably sell a lot on name recognition alone. But, Lenovo did poorly on a/the laptop reliability survey and don't have much in the way of options. You are stuck getting an ATI card practically down the entire model line (well, Thinkpads) and the rigid keyboards that impressed Thinkpad and even other notebook owners is gone now. Lenovo notebooks are said to be like other ones but I'm only speculating. I think it's good for one brand to mostly have 'business-line' notebooks but I don't think they're the same company anymore.