As a consultant I work almost exclusively with enterprise customers using Azure. When moving to the cloud for some of them the most regular reasons to keep stuf

As a consultant I work almost exclusively with enterprise customers using Azure. When moving to the cloud for some of them the most regular reasons to keep stuff on-prem are: * Regulation: it's mostly about data can't leave the given country's border. There's usually not much you can do about it. Offload stuff to the cloud what you can (computing), keep on-prem what you must (data). In these cases the integration between the two environments can be a real challenge sometimes. But Azure is quite strong on that front. * Stupid company policies set up during the last century or recently, but by people stuck in the last century. In some cases these can either be worked around or changed if you know the right people. But there's a lot of cases when it's hopeless from the start. Totally depends on company culture.