[focusgroup] Should we remove the "future considerations" out of the new explainer?

[janewman]

Specifically, the grid section takes up a lot of the existing explainer, and is not something we are ready to go after for the first version of the API, should it be removed from scoped Focusgroup (Explainer) | Open UI?
We could keep it as a mention, similar to how this doc treats CSS support.

[lukewarlow]

Maybe move to a separate document that's linked to? No need to be in the sidebar.

Alternatively put it in a details so it's collapsed?