@gordonparet I don't imagine the 150 St connection would be anything more than a two-lane, mixed-mode street that provides benefit to the residents and amenities planned for the site. A wider arterial road designed only to convenience peak-hour commuters provides no such benefit to the developer.
Many of those dead-ends are a result of how transportation planning has shifted and changed over time - i.e., turning historical main streets into commuter arterials, splitting traffic into one-ways across distinct arterials, and of course the prep work that was the beginning of METS before it was cancelled.
Modern transportation planning recognizes that past planning practices have been detrimental to cities and communities, exactly because they focused on the fastest and most efficient ways to move cars across large distances, rather than thinking about how they serve people, or how they can build a city that provides people with more choice about how they move about, or choice on how far they have to move for any given trip.
So sure, we could "fix" those places where some extra turns are required, but we have to realize those those fixes provide no real long-term benefits to managing traffic in a rapidly growing and urbanizing city, nor to building more livable communities throughout.