VMs definitely are leaky abstractions. Less so as time goes on and the illusion is refined. Eg timekeeping used to be a problem on VMs. And how many people have

VMs definitely are leaky abstractions. Less so as time goes on and the illusion is refined. Eg timekeeping used to be a problem on VMs. And how many people have spent dev time debugging mysterious freezes on EC2 only to discover their RDS or whatever had been on a bursting instance type?