オブジェクト構築にビルダー パターンを使用する必要があるのはどのような場合ですか?

public class Pizza {
    private int size;
    private boolean cheese;
    private boolean pepperoni;
    private boolean bacon;

    private Pizza(Builder builder) {
        this.size = builder.size;
        this.cheese = builder.cheese;
        this.pepperoni = builder.pepperoni;
        this.bacon = builder.bacon;
    }

    public static class Builder {
        // Required
        private final int size;

        // Optional
        private boolean cheese = false;
        private boolean pepperoni = false;
        private boolean bacon = false;

        public Builder(int size) {
            this.size = size;
        }

        public Builder cheese(boolean value) {
            this.cheese = value;
            return this;
        }

        public Builder pepperoni(boolean value) {
            this.pepperoni = value;
            return this;
        }

        public Builder bacon(boolean value) {
            this.bacon = value;
            return this;
        }

        public Pizza build() {
            return new Pizza(this);
        }
    }
}

Pizza pizza = new Pizza.Builder(12)
                .cheese(true)
                .pepperoni(true)
                .bacon(false)
                .build();