Yes. PaaS goes a step further and abstracts away the management of the operating system, middleware, and runtime. SaaS provides the entire end-user application as-a-Service, abstracting away the entire rest of the stack(too much).https://www.ibm.com/topics/iaas#:~:text=IaaS%20abstracts%20away%20the%20physical,system%2C%20middleware%2C%20and%20runtime.
PaaS and SaaS both models are correct, but I think PaaS is better answer here, if we move from on-prem to XaaS model.
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