What happens when the encryption is broken in the future? I feel like relying solely on the key isn’t good enough.
This works on the economic argument that if you could easily recover data from a disk that's been rewritten, drive manufacturers would exploit that already to increase storage.
If your threat model includes attackers who bypass the firmware to read overwritten data, you are probably boned several other ways.
Of course this matters less on slow disks, where the bottleneck is the writing speeds anyway.
Your great, great grandchildren will be embarrassed of the websites you visited.
Asymmetric algorithms like RSA are the ones you should be worrying about, and I can't imagine any reason someone would do disk encryption with an asymmetric algorithm.