The expansion cards always seemed a gimmick to me: it's just a USB-C port, loaded down with the extra plastic necessary to claim it's an expansion port. I guess some folks find it more convenient than a dongle, but when I'm using a laptop for portability it's rare I want anything other than USB-C. (When the laptop is sitting at home or in the office on a desk, just plug in a Thunderbolt dock and get all the ports I could want.)