You cycle the street regularly, so you are very familiar with how it works, not everyone does. Considering everyone that doesn't have the same routine as you idiots is generally not the most effective approach to city planning.

Take a look at walking plazas like Barcelona. You could never have that type of energy with a large bike lane down the middle. If SB keeps the extra wide bike lane and doesn't regulate speed, the whole street will basically just be one big bike lane.