Drives that lack cryptographic scrambling are not rare. Search a few vendors' sites and you'll find some that don't support "self-encrypting" capabilities.
It's pretty common for drives to have hardware AES support even if they don't implement the full TCG Opal feature set for use as a "self encrypting drive". I think Phison is the only SSD controller vendor that doesn't advertise encryption capability on all of their mainstream SSD controllers.