I agree with the majority of your points. It does feel a little bit early access and the stop sign thing was a pain point.

I'll just offer a counterpoint to your comment of Industry, Park, University district. Although the latter two don't have much besides individual buildings to place, Industries feel way better integrated in 2 than 1. In C:S1 you had generic and specialized industry zoning which was entirely separate from the Industry district. This sort of zoning made things brought by DLC feel tacked on. We might see DLC for C:S2 work the same way but there's an opportunity to integrate it more fully with base Cities Skylines systems, like satellite campuses and sports arenas being an "upgrade" for a college for example.