that depends on what you consider a problem.
a container based system where every app is in a separate container (sharing no files) would be considerably more secure than having several apps in each VM.
The only way the container would be less secure is if you think that there are more likely to be vunerabilities in the container code than in the VM hypervisor code + the kernel used in the VM
different people will come down differently on this question, so it's far from clear that a small number of VMs are the 'right' answer.
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