The world has too many remnants of old towns, general defacement (not major as in rule breaking, but minor instances across the world), and various clearly out of place blocks and/or modifications to landscapes that take away from the aspect of it being a world map server. Not only is this ugly, and ruins the aesthetic of areas, but it can be gameplay affecting, where youll have a few various block remnants from ships stuck in the ocean, or strange deformations with the sea itself and what seems to be holes of air in the ocean.

If possible, Regening all unclaimed chunks would eliminate all of the aforementioned, and generally benefit the server. Its not a "wipe" or a change that would restart progress across the globe, but something that I believe would better the server both gameplay-wise and aethetically. Take for example, this area here in South America : https://gyazo.com/5cd45e0db42b3e95247c97cee42c89b9 or here, in Mexico : https://gyazo.com/761ef86d6971c74adfdf9c8fdf7adda7, or across the globe, here in India : https://gyazo.com/2573df5b2eef637f0fa46d68fa3c521e. All of these areas have old, unused, and "defaced" (not really defacement) land. As a new player, sure, some might want to utilize old land with structures that are built, but personally and i'm sure for many having the land be "untouched" would be better, because you can make your town fit into the landscape easier, and you can modify the area easier.

The chunks that are suggested to be regened are all unclaimed chunks that are >3 chunks from any claimed town, to avoid people having random dirt walls or map design basically swallow the border of their town.

Along with that, I feel this should only extend from skylimit to Y-50, As to avoid destroying underground tunnel systems and railroads, and/or regenerating all spawners, Although I wouldn't be completely against regening to bedrock, either.

I understand this may interfere with any highways made across the map, specifically those unclaimed, but at the end of the day I feel it would be better for some used roads to be removed and need to be rebuilt, than to keep the map and terrain continue looking how it does.

TL;DR, Regen all unclaimed chunks 3+ chunks away from any currently claimed land, It benefits gameplay and aesthetics more than it harms it.