What are the reasons for the rare use of direct deployment of services on virtual machines in modern infrastructure?

Direct deployment of services on virtual machines in modern infrastructure is rare for several reasons:

• Scalability: Containers and orchestrators (e.g., Kubernetes) provide more flexible and faster scaling compared to virtual machines.
• Resource efficiency: Containers use fewer resources as they share the OS kernel, unlike virtual machines which require a separate OS.
• Deployment speed: Containers start and update faster, which is important for CI/CD processes.
• Management and automation: Modern tools better integrate with container technologies, simplifying automation and support.

Thus, virtual machines are often used as an infrastructure layer, and services are deployed in containers on top of them.