Different Old World Sizes in Bedrock Edition

With the new world heights coming in 1.17, we should have different world sizes for the Old World generation The classic 128×128×128 A new size with the current 1.16 height 256×256×256 And a new 320×320×320 I feel this world be perfect and make the Old World generation more up-to-date since there hasn't been much changes with it. Maybe add in an option to make it possible to expand Old Worlds with the new sized like in the legacy console editions.