Oh, getting back to the original question here, hiding that block indicates a direction and it would make sense to do some kind of training right now so people are comfortable with blocks (in case it's removed totally and completely someday soon™).
It would make sense to plan the client training on blocks right now not when the block vanishes completely forever, right?
I suppose some people don't want to learn just yet, but with WordPress going towards blocks. It would be best to do that before it vanishes someday.