Well, if the whole async 'I/O is the bottleneck' principle which was the refrain from a few years ago is actually true, then servers running databases should be

Well, if the whole async 'I/O is the bottleneck' principle which was the refrain from a few years ago is actually true, then servers running databases should be focusing on upgrading their storage to these levels, since that's where the most bang for buck comes from in terms of performance gain is (of course now the big thing is running everything on clouds like AWS where everything is dog slow and really expensive, so perhaps it doesn't actually matter). (In fact the main reason for the API changes covered in the article is because the CPU and RAM can no longer run laps around storage).