However, SQLite, by default, always truncates the WAL files on last connection close

> When the last connection to a database closes, that connection does one last checkpoint and then deletes the WAL and its associated shared-memory file, to clean up the disk.

https://www.sqlite.org/wal.html

Yes, but you can't rely on an orderly database close when it comes to correctness. Non-clean shutdowns are much more common than actual low-level data corruption in many SQLite applications.