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When you send your laptop to Apple, they also try this compressed air trick (instore at least in UK) - and if that fails, they do the replacement programme. There are two types of failures, one is indeed something merely being stuck underneath the key, the other is total key failure.

YMMV with what your store/Apple employee do of course. But it does beg the question, why should anyone have to use compressed air on keyboards, I mean to date have you ever had to prior to butterfly keys? I have used and seen keyboards with enough gunk beneath the keys to be a potential health hazard, still typing away perfectly fine without breaking.
I mean, some of us are grossed out by the "gunk in the keyboards" so we would probably use compressed air anyway.
 
You don't. It'll probably help in a small number of cases, but I have lots of reasons to believe that the compressed air thing is just smokescreen to avoid having to admit that they can't solve the manufacturing issues that seem to cause these keyboard issues. Some of those jams are going to resolve on their own anyway compressed air or not. Some of the ones prone to jam will respond simply to methodically jiggling the keys or being handled.

I've had one MBP (2016) that had intermittent keyboard issues that eventually went away entirely after getting broken in and my current MBP's (late 2018) keyboard has been flawless. Neither one ever saw compressed air or was treated with kid gloves. Neither was abused, but both saw their share of debris as they are my workhorses and not show horses.

The moment you have that Apple logo at the back of your screen its already a show.
 
Well, this thread is three months old, and it started with one report of a sticky "6" key. So far, people have piled on with disapproval about the butterfly keyboard design and Apple in general. Me included. But, there are really no posts on this thread with examples of additional instances of 2019 Keyboard failures. So, we have a bit of an echo chamber going here. Again, I am guilty as well.

In the interest of trying to be balanced, let me say that I bought my 2019 MBA about 3 months ago, and it has been flawless. No problems with the keyboard or anything at all. Second, I just don't see very many posts on this forum and other sites highlighting problems with the 2019 Keyboard, which has been in the wild for over 4 months. In contrast, soon after release of the older keyboards, there were tons of posts on multiple forums and review sites that highlighted issues with the older version. So, maybe Apple has made some headway improving the reliability of this design. Is it perfect? Heck no. Is it acceptably reliable, given that no keyboard design is 100% free of failures? Too early to say. But, maybe we are headed in the right direction, which is good news for consumers.
 
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I bought a 2019 13-inch Macbook Pro (i5 1.4GHz) when it came out. After the function key (Fn) got stuck, I returned it. I think the keyboard could be more reliable compared to previous model years, but that probably does not matter anymore.
 
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