When Sea Defences Are Not Replaced?

In 2013-2014, a hole was punched in Cwm Ivy's sea defences by extreme weather conditions. The National Trust (NT) are responsible for this area of the Welsh Gower Peninsula. They elected not to make repairs, which was inline with a new policy not to attempt to defend indefensible coastal areas (https://www.theguardian.com/uk-news/2021/may/10/wales-wildlife-haven-born-out-of-disaster-cwm-ivy). The NT were able to make this initially-unpopular decision, because this area has a sparse human population. The sea duly rolled in, killing trees and removing some low grade agricultural land. In only 7 years, however, Cwm Ivy has reverted to becoming a pristine salt marsh. The area is now rich in new flora and fauna. Otters, Ospreys, Curlews and Skylarks can all be seen at Cwm Ivy. Sometimes, letting a place rewild itself is the best policy! Expensive defences don't have to be constantly repaired and an interesting natural history location is created.