Do you really have a lot of programmers typing on a laptop keyboard for much of the day? That would seem really strange to me. No laptop keyboard is good compared to a good mechanical, or really any external keyboard. I have one of these pros and I type on it a fair bit because I commute on the bus and I agree its not the best...but at the office I have proper equipment for doing programming work.
I also have a 2015 MBP at work, though newer hires have the ones with the new keyboard and touch bar, and while I primarily work at my desk with a keyboard plugged in (the basic apple keyboard, no numpad), I certainly go to meetings and work in other rooms that require me to use the onboard keyboard all the time, as do my colleagues.
I'm typing on my 2015 MBP right now! It's not as good as a blue-switch or Alps mechanical keyboard, but it's pretty damn good!
Just looking around though, I can see that the majority of external-keyboard users here in the office are using 2016-and-later 4th gen MBPs. The keyboard is just bad enough to mandate rather than encourage external keyboard use.
