Wait, so they are not even halfway through the transition to USB-C and they launch a new product with the legacy connector? How many cables do they expect us to keep around? I'll wait for AirPod Max S :)
Apple isn't transitioning their handheld lines to USB-C.
Their portable lines — laptops, laptop-sized pro tablet — all use USB-C for charging and peripherals compatibility. Their handheld lines — cell phones, earbuds, headphones, TV remotes — all charge with Lightning.
(The older end of the Beats product lines use Micro USB due to having been an Android ecosystem product prior to Apple's purchase; however, Beats products released this year seem to be Lightning.)
I treat the non-pro iPad as a "handheld" device, and the pro iPad as a "portable" device. There are probably more nuanced words in use at Apple for deciding whether a product gets USB-C or Lightning, but I'm not invested in my choice of words, just in highlighting the distinction between the two categories.
It's still used in new Apple products including all iPhones, non-pro iPads, the Apple TV remote, Magic Mouse, Magic Trackpad, and the charging cases for all AirPods.
USB-C and Thunderbolt 3 are different things. USB-C is a connector defined as part of the USB spec, which was developed in tandem with USB 3.1. TB3 is a different spec, basically an external PCIe interface, that uses the USB-C connector (used to use mini DisplayPort). Typically, TB3 ports are also compatible with USB 3.1, but I don't think that's a requirement.
source: https://www.apple.com/airpods-max/