I retired my T420 (not quite the same as a T420s, but close) for a T460p and I don't see what all of the keyboard whinging is about. Sure, it changes how you do some things, but (at least in my case) not to the detriment of productivity. Working from my home office, the laptop is in a docking station with an external keyboard attached. And when I'm traveling, the built-in keyboard is comfortable, has good tactile feedback (although less travel than the T420) and I can still do everything I did before ... that includes the usual business-oriented office tasks, coding in a variety of languages, running multiple development and testing environments/VMs, and interacting with remote systems/applications at customer sites. On a good day I can type pretty close to 120 words per minute, but I rarely do as my most common role is "thinker" rather than "transcriptionist."

And I'm now rocking 32GB of RAM, which is something I could have used years ago