This is the definition of a PRO machine, people who have extraordinary requirements and need power and flexibility. Stop telling them they have "enough", you ar

This is the definition of a PRO machine, people who have extraordinary requirements and need power and flexibility. Stop telling them they have "enough", you are not in the position to make that call. With respect though, you're talking about different sets of constraints. The iMac pro is inevitably targeted at the group of people who don't need to upgrade, and maybe they will replace their machine every three to five years. Realistically, there is a limited amount of upgrading that will be done for most users, meaning that engineering effort that goes into building an expandable machine is relatively wasted. The iMac Pro will not be suitable for every professional user, but it will cover a lot of use cases, and that's okay. If you do need an expandable machine, then there are other options there – but most people don't.