This year, the migration projects I have worked on were some of the most fun. Migrations have changed from the death-by-1000-cuts that they were, to the which-AI-method-to-best-ensure-100%-fidelity. So, I don't believe the "very hard" part. Obviously it would involved recreating or reshaping many features that very involved in an integration to have a disruption-free move, but I think the complexity is manageable for most companies if they put in some effort.