Re: would it not be better to... @DougS
"Big advantage for SSDs in that regard, erasing a hard drive partition requires actual writes"
Yes and no.
For traditional hard drives you are spot on, but Self-Encrypting Drives ("SED") encrypt everything. Some SSD and HDD models have SED capability but not all.
The drives have a default encryption key already set in the factory (and printed on the drive label). With the default key the drives are essentially unencrypted, but if the encryption key is set then the drive appears bricked unless the correct key is entered upon boot. The drive can be unbricked with a special software but that renders the previous contents unreadable and the drive appears afterwards as unpartitioned, clean drive.