As I said, only Apple knows the actual data. This doesn't mean the many reports of reliability issues, although anecdotal, cannot be taken into account to try to gauge the situation.
You can try using anecdotal points, but you won't conclude anything with it. It doesn't move the needle one way or the other.
I've had issues with my old Alienware X51 R2. Had it replaced 7+ times (have the receipts for all replacements). Looking online, there are many reports of overheating and random shutdown issues. Was a design failure? I want to say yes, but thinking objectively, I can't say yes or no without hard data.
Nobody claimed it is a "guarantee", but it is definitely a telltale sign.
Again, it's not "proof" but it's definitely yet another telltale sign.
That pretty much says you're just as potentially wrong as I am. See above.
The main issue with your reasoning is that you are trying to explain the issue with an explanation which is more far-fetched. This doesn't mean your explanation is impossible, but to summarize:
- There is significant anecdotal evidence reported that there are issue with the keyboard design.
- Teardowns confirmed that the keyboard design is indeed particularly susceptible to failure.
- Apple modifies the design, the new design being more protective of the keyboard from dust.
- Apple launches a repair program.
The simplest explanation is that the keyboard was especially unreliable. This explains all points above quite neatly.
"Far-fetched" is subjective.
Again, anecdotal points cannot possibly move the needle significantly one way or the other without additional data. "Significant anecdotal evidence" isn't scientific at all.
You want to believe it so much that it is a design fault but it's entirely possible Apple replaced the design because people simply didn't like it. People vote with their wallets and Apple listened.
Is your alternative explanation possible? Definitely, but it's definitely more convoluted, needing an explanation as of why there are so many reports of unreliability when the reliability is not an issue, or why the teardown shows susceptibility to failure wheares there is none, etc...
Evaluating the two explanations objectively, Occam's Razor points clearly at the "simplest" explanation being the more likely to be correct.
According to a report by Consumer Reports 2016 (I don't have the link anymore as I'm no longer a CR subscriber, but I can point you to a publication that reported on this), Apple has a 10% breakage rate by the end of a 2nd year of ownership.
Butterfly switch MacBooks were sold since 2015. Apple sells about 18 million Macs per year, but let's just say 10 million per year are MacBooks with butterfly switches (that's being conservative, Apple says MacBooks are the most popular Macs they sell). That's 50 million MacBooks with butterfly switches. That's about 5 million broken MacBooks out there in the world right now.
So at a 10% failure rate, 5 million MacBooks are bound to have MANY reports of keyboard failures, especially when each of those 78 keys are a movable part compared to, say, a camera.
So when you ask "why there are so many reports of unreliability", there's your answer. This is objective.
I can hypothesize that the combination of these reasons is why keyboard issues are overblown:
- It's a new piece of technology and therefore gave people a thing to blame
- People generally don't like the feel of the keys and therefore have an overall negative feel to the keyboard
- Social media growth gave customers a megaphone for any issues (Twitter grew from ~30 million active monthly users in 2010 to 300 million in 2015, for instance)
If you are a CEO and there are rumors that your product is unreliable, the last thing you would do is to issue a repair program, because it's bound to be interpreted in the obvious way: "if the product needs a repair program, it's unreliable. Confirmed!". It would be the dumbest PR move ever.
If I saw the data showing it's not an issue, I'd launch a program to back the keyboard reliability and ease the minds of current and potential customers. It's subjective of whether it's the dumbest PR move ever. Saying "you're typing it wrong" would be the dumbest PR move ever IMO.
Apple is much more likely to have issued the repair program because... the keyboard needed a repair program.
To back the product and ease the minds of current and potential customers. Good PR move to keep the trust of customers.