The original design included a tunnel of about half a km down Richmond to avoid the at-grade rail crossing and the terminally backed up Richmond & Oxford intersection. That however didn't fly as it with the bus-only lane would have brought crucial Richmond down to one lane in each direction, required the permanent destruction of many buildings and trees, as well as played havoc on the road during construction.
Richmond is the only route that goes from downtown to the north of the city and connects downtown, Richmond Row, a hospital, a high density student ghetto, Western, Masonville {which is the largest and busiest mall in the city}, and to the fastest growing urban area of the city in an already fast growing city. If part of a rapid transit system is also a way to help create livable and transit friendly environments then this would have decimated much of it. This is particularly true along downtown's Richmond Row which is the city's premier shopping, restaurant, entertainment, nightlife, and especially restaurant district.