I have to wonder if cleanliness and care for the device is a big contributor to this issue. The people I personally know that have been impacted by this keyboard problem are the same folks that seem to treat their devices pretty badly: grimy keyboard/trackpad, outer case has all sorts of visible evidence of minor damage, and/or the device is carried around without a sleeve in a bag where it's jumbled up with other misc items and debris.

Never vacuumed a keyboard and wipe every 5 years or so :)

I don't use an alcohol wipe and I use an external keyboard almost 80% of the time. I still clean my keyboard with pushed air once every two weeks because keys get stuck. For the record I close my laptop when not in use to avoid having dust settle in.