Why is the default value of write.metadata.delete-after-commit.enabled set to false?

[lintingbin]

Query engine

Flink，Spark，Trino

Question

What are the benefits of the default value of write.metadata.delete-after-commit.enabled being false? Setting it to false will leave many useless files on the object storage, so why not set its default value to true?
Why is write.metadata.previous-versions-max configured as 100? It feels like keeping 10 files would be enough.
Is there any special meaning behind the configuration of these two parameters?