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They are making 2 separate arguments then. What they are arguing against is standardization, which is just as important

Addressed in Section 4, Question 3.

The question remains if companies and developers value or care about the flexibility of creating "page table rules".

For highly scalable systems, the perf trade-off is just a matter of spinning up more VMs.

The higher-order benefit is you can expect your operating system and VM to behave the same, no matter what

Spinning up more VMs costs more. That was a bigger issue in 1996 than now, but still an issue for large deployments.