Two houses can sit a few blocks apart and price differently because one backs onto a busier street, sits in a different school catchment or carries an older roof, and an agent who has actually walked those streets catches that where a purely data-driven comparison does not.
It matters most in neighbourhoods with mixed housing stock, where the same square footage covers a heavily renovated character home and one that has had nothing done to it since it was built, since a generic comparable-sale average flattens that difference into a single misleading number.
It matters less in a brand-new, uniform subdivision where every house is close to identical, but even there, local knowledge helps an agent read which lots and orientations buyers actually prefer, and confirm that against the city's $444,700 rather than assuming every house is priced the same. Get your hand-reviewed valuation from Joel Dyck.