At least where I live, such a type of intersection is used when a residential street branches off a large main road. You do not have a high volume of traffic go

At least where I live, such a type of intersection is used when a residential street branches off a large main road. You do not have a high volume of traffic going into this residential street, and "waiting for a crossing cyclist" does only take 1-2 seconds. So a buffer size of 1 is usually enough.