Is IPFS blocks useful on it's own?

After a data migration from my SSD to HDD went bad, i have over 5Gb of .ipfs/blocks on my node. Are they still be of use to me or others? Should i just leave it there or delete it for good?

I trusted that i couldn’t get my previous entries on my IPFS Desktop anymore. Am i right?

Yes they are. They are

too late, they’re long gone!