Mmmmno. Hybrid drives are convenient, I give you that, but they are very limited in what sort of information they have about the data and its uses and if/when a new filesystem format comes around which the drive's firmware doesn't understand the drive falls back to dumb block-based caching. Cache done on OS-side of things have access to things like frequency of use, what sort of situations are the files used, expected ranges of reads and writes in the various aforementioned situations, new, improved filesystems, actual content-type, which user or users are logged on and so on. The hybrid drive, for example, cannot know who is logged in or that the user likes to e.g. listen to certain playlist while doing image-manipulation -- it doesn't know how to predict these situations and preload/cache things accordingly.