Last month, Apple initiated a Keyboard Service Program for MacBook and MacBook Pro, after determining that a "small percentage" of the keyboards in 2015-2017 MacBook and 2016-2017 MacBook Pro models may experience keys that feel "sticky," repeat, or do not respond in a consistent manner.
Apple did not identify a cause for the issues, which they call "behaviors," but they're believed to be caused by dust and other particulates becoming stuck in the butterfly switch mechanism underneath keycaps.
Apple has been servicing affected keyboards free of charge, with the process involving the replacement of one or more keys, or the whole keyboard. For the MacBook Pro, the replacements are second-generation keyboards -- often the 2017 variant with slightly different markings on the Control and Option keys.
Then, last week, Apple surprised us with new 2018 MacBook Pro models that feature an "improved third-generation keyboard for quieter typing." These models are not eligible, at least not now, for Apple's service program.
Apple hasn't directly acknowledged whether the quieter, third-generation keyboards dually address the keyboard issues, but iFixit discovered the 2018 MacBook Pro has a thin, silicone barrier underneath each key, which they believe are intended to prevent the dust and crumbs from getting stuck.
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