Renogy BT1 Setup and Review. Why isn't this part of the main unit from the factory?

Bench Overview: Quick look at Renogy BT1 Setup and Review. Why isn't this part of the main unit from the factory? in the shop.

To better track my power usage and charging I ordered this small BT unit for my new charge controller. It works great, but honestly, why isn't this part of the unit from the factory?
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