By default, index full-page write is disabled. If the index is broken, you can rebuild the index to solve it. Although the security of index data cannot be guaranteed, this setting can greatly reduce the problem of storage space explosion caused by wal write amplification.
I would feel funny about a parameter like that.
I agree. To allow for indexes to become corrupt by design would be a bad idea. Rebuilding indexes is a not a solution as some index rebuilds takes hours on very large tables. Dealing with identifying corrupted indexes and the issues caused by them would be a nightmare to deal with and not very ACID compliant.