Ask HN: Why wireless laptop peripherals connect to dongle instead of Bluetooth?

Let's use this "Bluetooth / wireless" Jabra headset as an example https://www.jabra.com/business/office-headsets/jabra-evolve/jabra-evolve-75

Despite the misleading product website, the headset will NOT connect to your laptop via Bluetooth - it will wirelessly connect to a USB (A!) dongle.

I did some research recently and I can not find an office headset that will connect to my laptop via Bluetooth without a dongle or a base. Also many wireless mouses and keyboards connect to a dongle, with the notable exception of Apple products. What is going on?