I'm extremely disappointed rn

The devs long ago said that they consider the game feature complete and would be focusing on QoL improvements, so the game itself is done. [Console] Update 2134 Release Notes (+ hotfix 2136) - #15 by Clare

As for the big world update, the consoles would never be able to handle it. Hell, it strains gaming PCs half the time. They even said in Jan of last year that they had no plans of giving the consoles this update. You just gotta check and keep up on the forums. Pc’s map editor to consoles - #2 by Clare

The reason why they limited the number of custom islands is simple. Consoles can only handle so much as they do not have anywhere near the memory or processing of PCs. Unlimited custom islands gives you unlimited resources, but it also causes too many issues for the consoles as they cannot handle the number of items that it would have to keep up with. And, as I have said before many times, the game was never meant to be infinite survival. The point of the game is to survive long enough to defeat the three bosses and escape Pacifica. This isn’t Subnautica, where you have infinite food and water and resources and it was never designed that way and people really need to stop expecting it to be.

TLDR: Quit whining and moaning because you want the play the game in a way it isn’t meant to be played!