This IS a business issue. It has a quantifiable effect on profit margins for Apple's macbook, and I would look at it as an investor and see if it effects Apple's valuation in the short and long run.
The Note 7 is a fantastic comparison - the complete recall did not have to happen but did because of design choices from Samsung engineers. It could have been a $200 million dollar issue instead of a $5 billion dollar one.
Similarly, these keyboards did not have to be that expensive to repair or be so prone to damage, but being that way has a snowball effect on repair/maintenance/warranty.
It's also a design decision that they're kind of stuck with. They are not going to go back to their original keyboards (unless they release a mac book pro classic, which I would personally be estatic about) - and so the increase repair costs cutting into their margins is a challenge for them to solve going forward (especially since the brittle-ness is because of the thin design).