If MS is promoting FLOW as successor of SharePoint Designer workflows, then it should have following capabilities Allow FLOWS to be published by service account and to be consumed by all users. [Off-course this approach has drawback with current 50 flow limitation but I assume this would increase] Allow certain action to be executed in context of the service account [which is used to publish the flow] Hope this is considered!!
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It has always been possible run a flow with any type of account -- user account or service account. When you log into the Flow portal simply log in with the service account instead of the user account. This is common for enterprises that have the requirements you call out. Can you please specify the gap in the product that needs to be fixed to support your scenario?