I really don't see a need for the 24-hour lock, rather, I don't really care if someone wants to practice on my base before attacking it for real or not. Their time wasted, not mine.
That being said, its easy enough for a th8 to practice attacking on someone in normal matchmaking that it would not make a difference at all if they were allowed to sandbox or not.
Additionally, having th8s allowed to practice means most of you complain and cry, and that makes me happy inside. Mostly because it means you take this far too serious, and that is funny to me.

