I completely agree with you on some points.
For building bridges and learning the game basics,
Practicing in your own single-player world is honestly much better and gives you more freedom.
However, a Training arena in the server would be
absolutely amazing for PvP!
Fighting against smart bots with the
exact same server ping and hit registration is something you can't replicate in a normal world.
To make this idea even better, Developers can place players in the same arena but with
invisible borders between them.
This way everyone has their own private space with their own bot.
Players should be able to customize their bots, Like
increasing the bot's skill level and movement speed and other settings.
This technical solution avoids creating too many separate worlds and will definitely attract players from other servers just to practice here!
Well said, Thanks for sharing!
Best regards 