Not being able to claim land in the nether and end really makes you miss out on a whole new level of base designing. With the recent influx of new players a large amount of land that is unclaimed is getting difficult to find. A simple solution to this would be allowing claims in the end and nether. I understand that if the end were to be claimable there would be a couple problems. The main one would be that someone would be able to claim the main island, this is why I recommend having a 1,000*1,000 area where land cannot be claimed but can be built on by everyone. This would make it much easier for people to come and go from the end without having to worry about the end portal being blocked or not being able to leave the main island. Let me know what you think! Personally, End claims would be a really fun way to expand and build!