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Because all kernels fail to meet the needs of OpenOffice's high-performance architecture. Yes, I'm kidding.
Actually he seems to mostly be insinuating that kernels need to deal with application latency in general, as a means of making the startup time of OpenOffice seem less of its own problem, and more inherent to the limitations of hardware and operating system architecture. "Why is OpenOffice's startup time so slow? Well, HDDs are slow. Networks are slow. Kernels don't predictively preload applications based on user models." Sort of ignoring the "Why is it so much slower than everything else, and can that be fixed?"
If changes are made to hardware or operating systems, until the startup latency drops below a noticeable threshold for OpenOffice, it's still going to seem comparatively slow to startup than everything else.