Which workloads should remain on-premises?

Which workloads should remain on-premises?

Customers are working on a roadmap to do a technology refresh of their current application landscape and/or they are introducing new application. What should remain on-premises? Customers are struggling with questions like: should I use the public cloud? Could I replace some on-premises applications with Software-as-a-Services applications on a pay-as-you-go model? Is it possible to