Wait, I thought they would replace it with a third gen, but apparently I was wrong (just googled to check). The touchbar generation MBPs (2016), to the best of my knowledge, came with the 2nd gen all along (1st gen was in the 2015 non-pro MacBooks). I was assuming I got a 3rd gen, because the keys feel a little more responsive/springy and less sticky when they work correctly. But ok, maybe the original 2nd gen keyboard was just a bad sample in that regard.
Still, just to make sure I'm getting it right, here's what Apple did:
1) they acknowledge an issue with a "small" number of keyboards, which is nonetheless large enough to give rise to a class action lawsuit somehow
2) they come up with a "patch" to the issue, which consists of sort of a rubber seal and call that 3rd gen
3) they tell everyone 3rd gen doesn't fix any reliability issues
4) they start an exchange program for 2nd gen, and they decide to replace the faulty 2nd gen with more 2nd gen keyboards that have the same issue
Can somebody explain what the hell they're trying to do here? Yes, (4) is in line with their statement in (3), but I'm not sure anyone truly believes they only fixed it for the sound it makes? I mean, they release a new keyboard (2nd gen) and EVERYBODY is crying out that their keys stop working. Then they go ahead and re-engineer it for the single purpose of making it a tad quieter, but don't address the one issue everyone was complaining about? Possible? Yes. Plausible? Press X for doubt.
X.
And regarding the "low percentage" of keyboards affected: Let's do some math.
As it would appear, I'm on my second 2nd gen keyboard, which is also starting to have the issue now, after about 3-4 months of use. Add to that my ex's 2016 13" MBP, also with the 2nd gen keyboard, which was the first one in this household to have the typical issues. So we're 3 for 3 when it comes to failing 2nd gen keyboards.
Let's say anything below 10% would be a "low percentage". Put these numbers in a Poisson distribution, and we find that at a base rate of 10%, the probability of getting 3 affected keyboards in a sample of size 3 is 0.00015, or 0.015%. So if Apple says that the number of affected keyboards is low, based on my personal experience (3 keyboards) I can say there's a 0.015% chance of them being truthful.
Of course, it could be that most MBPs are kept in, I suppose, less dusty environments and thus never develop the symptoms, but that doesn't mean that those keyboards would be "resistant" to the issue in any way. And if it really is a matter of the environment more than the specific sample one gets, then how is exchanging it for another 2nd get keyboard gonna help anyone? (Also I'd say that my use case is nothing out of the ordinary. I use it a lot, yes, but no differently from the 2 previous MBPs I've owned, which never had a single issue with the keyboard. My ex was even particularly careful about hers.)
And as I type this, my enter key has gotten worse, with the top half now also being kinda stuck.
(I do realize that this thread is technically not the right place for discussing my issues, as I was wrong about having a 3rd gen keyboard, so I apologize for that.)
One advantage of the second generation butterfly keyboard is the ability to clean it with pressurized air. With the membrane on the third generation keyboard, it doesn't work.
Follow this support document from Apple and it should help you out.
Note - I consider having to do this procedure unacceptable but it does work in many cases. The only other option is to take it to Apple and have them replace the keyboard again.