I'm guessing it was Samsung neutering the platform. They never have really given too much time to advertising the capabilities of the platform (for example, no displays in their stores demoing the "phone as a desktop" capability).

The Samsung DeX Station (https://www.samsung.com/au/galaxy-s8-accessories/dex-station...) is no longer manufactured which is a massive let down. It does however still work with the S10+, and I presume the S20. The ability send a network cable straight to the phone was pretty handy for a few situations.