We've waited long enough.
You evidently don't understand how capitalism works.
They added Chess960 to the app. But relatively few people play it.
So they stopped development (or at least that is not their focus.)
They added Puzzle Rush. A lot of people love it. They are signing up for memberships just to play it.
That will be developed further. Puzzle Rush is not on the Android yet. Look for that to come long before anything is done for Chess960.
A lot of people like the streams on Twitch. Those pay for themselves with ads. You will see a lot more of that.
If you want something done, show them the money.