I guess in the end its really depends on what you enjoy the most about the game.
I personally enjoy a balance of activities, so restarting is not a bad thing. I get to experiment with building new starter homes on a fresh world, do some chill hunting or resource collecting, then add in some exploring... all without really dangerous events, until I am ready.

If you prefer the combat and progression then there is not that much added, some new armours, new mobs, new dungeons... all cool but wont validate a start from scratch.
In that case it may be more worthwhile to wait for Mistlands, then restart so you have a nice chunk of game to work through with new stuff to look forward to.