What do you do if your laptop gets wet or lost? Or if someone runs it over? There’s not a ton of instances where the system won’t boot but somehow the SSD has survived.
Besides, the recent storage Apple has used is all encrypted with the keys stored in the Secure Enclave. Data cannot be recovered if you don’t have the board (even on the Mac Pro, IIRC).
Of the 2 laptop failures I've experienced both of them wouldn't boot but the data was recoverable because the drive didn't fail. Only in a vanishingly small percent of cases is the computer so destroyed that the SSD is also destroyed. The secure enclave is just another failing on Apple's part. If I'm encrypting my data it should be with keys I control. Apple should have a backup plan for users. Not doing so is negligent.
Besides, the recent storage Apple has used is all encrypted with the keys stored in the Secure Enclave. Data cannot be recovered if you don’t have the board (even on the Mac Pro, IIRC).