Broadly agreed.
I think you effectively said this, but I think it bares stating explicitly, Mx delivers among the most expensive transit projects and stations on Planet earth. For the budgets in question, I would not only expect architectural grandiosity, and top tier finishes, I would expect every conceivable amenity. A retail palace, a food hall, the seating should recline, and the leftover 150M can endow the station with a 5M per year operating subsidy for complimentary shoe-shine, wait-staff serving subsidized $1 canapes, and $6 cocktails (Happy Hour only!)
Of course, I'd be happy to see just a decently attractive station as outlined by
@NY99 above and put the remaining 300M per station into an endowment for lower prices and better service.