Stages SB20 functions

Now both tacx,wahoo & wattbike can have gears displayed in game, and the first two also support steering. And wahoo also have a power up button.

The Stages sb20 don’t support any of the above…

Is this a matter of economics?

Does Zwift wants some form of compensation to implement these features or is it Stages not wanting to put in the work updating their bike to support this?