The problem is that if the SSD suffers a power failure and reverts a 1 megabyte block of metadata to the way it was yesterday, the filesystem won't see that as corruption - since all the checksums will match.
Yet all the pointers in that metadata will point to data which no longer exists, and your filesystem will be destroyed.
Yet all the pointers in that metadata will point to data which no longer exists, and your filesystem will be destroyed.