I think Apple's current strategy makes perfect sense, bundling the (mostly non-upgradeable) computer and the display is perfectly reasonable for most consumers but breaks down for professional use cases.

Consumers will likely keep these devices for many years and want to just upgrade the whole thing at once, and the fact that both the display and computer are on the cheaper side makes this feasible to make the usability tradeoff worth it. A pro use case would want to be able to upgrade the very expensive display and the very expensive computer at different rates. The upgrade cycles don't really line up.