Speaking of write cache, the directive is to disable it on disk if you have another battery backed write cache sitting behind, or speaking of laptops you can have them since they are battery backed, no one says to disable cache completely.
You can start reading about it here -- http://xfs.org/index.php/XFS_FAQ#Q:_What_is_the_problem_w...
Speaking of caching in page cache, it is just to provide better I/O locality as mentioned in talk, it is flushed periodically, if it is flushed as and when required you will end up with seek nightmare with disk.
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