Generally it's just that it's really difficult to do it right. Sometime's it's impossible. It's often loads more work (which can be hard to debug). Furthermore,

Generally it's just that it's really difficult to do it right. Sometime's it's impossible. It's often loads more work (which can be hard to debug). Furthermore, it's frequently not even an advantage. Have a read of https://research.microsoft.com/pubs/163083/hotcbp12%20final.pdf https://research.microsoft.com/pubs/163083/hotcbp12%20final.... Remember corporate workloads frequently have very different requirements than consumer.