While this was the answer given in the past, I feel that limiting developers to a specific vision that intends to give feature parity, while actually allowing us to deviate from that parity in a number of ways (as discussed in this very stream, showing that it's preferable to give controller players a traditional UI instead of cursor controls), really makes the ecosystem feel lacking.
It often feels like "one step forward, but two steps back" - why can't we be trusted with making these design decisions for our own games, instead of being severely limited on what we're allowed to do because it requires a little bit more effort to follow the guidelines?
This simple feature would add a lot of new possibilities for our games.