So, I've owned a 2012 MBP which I bought as used. It's upgraded to the max and other than a current battery/battery alert notification issue, is working great when plugged in.
I decided to take the plunge and get a 2016 MBP in what is described as almost new condition. How concerned should I be about the keyboard? I realize that my 2012 keyboard, which I've had no issues with, is a completely different design, but now I'm beginning to wonder if I made a mistake in buying the 2016 MBP....
Look at the number of threads on the internet about it vs. the number of threads regarding previous model Macs or other PC laptop keyboard issues.
I'd be concerned. It's the sole reason i haven't upgraded my 2015 13" yet.
The fact that apple have abandoned it and gone back to scissor switches after denying there is an issue for 4 years (and eventually issuing a repair program after "silent" running updates to the mechanism proved futile) should be confirmation enough that it is serious.
As above the 2016 will be out of the exended repair program soon. I wouldn't risk any money on one at all as the repair out of warranty is very expensive. At least if you buy a new butterfly machine you have the assurance of 3-4 years of either applecare or extended keyboard program cover and can spread the purchase cost over 3-4 years.
If you buy a 2016 model today, you've basically burned the purchase price entirely if it dies, and the failure rate is high enough that i personally would not run that risk. Unless you got it very, very cheap?
Anecdotal, but a colleague had an early butterfly model (retina macbook 12") and went through 3 machines
in a couple of months before giving up and swapping it for a non-butterfly 13" model (which he is still using today, 4.5 years later, with zero issues). He loved the 12" Retina but he simply couldn't deal with constantly having to return the machines - he has work to do and it was costing him real consulting dollars to be without his primary work device.
He's a non-smoker, doesn't eat over his machines, etc. Any debris ingress would have been under "Reasonable use" (e.g., dust/fibres from carrying it in a protective sleeve, etc.).
If you plan on sitting it on a desk all day then maybe you'll be fine. But if you're going to lug it in a sleeve, etc. i'd consider that a risk.