All limits are artificial limits. Like two characters per island. Or five active characters total. Or four nobles for non-donators.
It's not artificial limits you're complaining about, but a change that will affect the way you play the game. I'm sorry that the limits will affect you in a negative way. (Fwiw: they hit me, too. I have to pause one of my characters right now before I can even play again.)
However, no one is forcing you to play on any particular island. The island you play on is your choice. The limit of one character per island is one that the dev team, and many experienced players, feel is an overall positive change. We hope that if you give it a chance, you will feel the same way.
