You can create and use custom servers without needing an alt account.
I learned how to enderpearl clutch a few months ago, and what I would have to do is create a freeshop treasure wars game, select the map, and try to clutch in the next minute before I would win because there was no other opponent. I want to make this easier by allowing players to create custom servers and play in them alone without needing an alt or friend.
If you do add this, it could make learning different skills on hive easier.
icon to see if your idea is a dupe next time