The keyboard is apparently different enough to give me issues with my hands. I never had a single RSI problem with the 2013 model with "the good keyboard". I could type on that thing all day. Now I find that the bones in my hands and fingers ache after prolonged typing.
When I'm "in the office" at work, I hook the laptop up to an external keyboard/monitor and things are fine. But I really feel it when I work remotely and use the native laptop keyboard. Like, literally feel it in my bones.
Speaking of the days I'm in my work office and "things are fine", they're not fine really. For I'd rather not have to reboot once a day just to fix the "oh look the external monitor has started flickering on and off again" issue.
Those previous generation MacBook Pros were really really really good. Now they're really really really not. Which is a shame.