Apple has looked at using single glass panels and touch-sensitive membranes to solve its butterfly keyboard problems, and may yet return to the idea for how it safeguards against dust damage in the mechanism.
Due to their design, keyboards are able to be affected by elements gumming up the mechanism, preventing the keys from smoothly lowering and raising when pressed.
While old-fashioned keyboards are less susceptible, the chiclet-style notebook keyboards, like the ones used in the MacBook Pro lineup, may be prone. They can easily be stopped from working efficiently if dust, crumbs, or liquids enter under the keys and impact the mechanism.
Read more at AppleInsider.com