Which is why i said from the beginning, it depends which city/neighborhood you live in, the market, etc.some places mortgages are higher than rent, some places it's slower, some of them it's the same. In the places where rent is close or higher, it probably makes sense to buy. But in most of the cities listed in the OP where rent is high, im willing to bet that house prices are high as fukk which would make your mortgage higher.
The OP listed NYC, Boston, LA, Austin, Seatle, etc with high rents. How much would it cost to buy a house or condo in those same cities?