Remember that player reactions start with properly reading the visual cues, so it makes the most sense to include those cues in training, not remove them.
There are different types of skills in volleyball - precise vs. improvisational. Training them each requires a different approach.
There are some significant drawbacks to playing games - especially scored ones. With some thought, though, we can work around them to our benefit.
Above and beyond all our coaching priorities we must also account for the priorities of the players when planning and running our sessions.
Here's an example of how you can use video to dramatically improve blocking drills when training your blockers in real game situations isn't an option.
We don't always have the resources we'd like to run the drills we want to run in practice. Here's an example of how I got creative with one, though.
You can use process scoring rather than more standard outcome based scoring to continue your development work in training games.
The concept of muscle memory is a misnomer that can lead to incorrect views about the process of motor learning and how best to achieve it.