Why do PD charging ports sometimes only support 65 watts and above devices (but not devices with less than 65 watts)?

Question

E.g., this laptop's specifications state (mirror) (MSI GS76 laptop):

PD charging port only supports 65W watts and above devices (e.g. adapter, powerbank).

score 1 · Answer 1 · answered Jul 24 '22 at 07:54

USB Power Delivery (USB-PD) specifications have evolved over the years, and not all specifications are backward-compatible.

You may read about the different specifications in Wikipedia USB Power Delivery.

Below is the table that is found in this article, which can show the differences between specifications:

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