Just a nit: you don't get a guaranteed failure at 64TB, you get a failure with approx 1-1/e ~= 63% probability. At 32TB you get a failure with approx 1-1/sqrt(e) ~= 39% probability.
I do agree that tens of TBs are not too much data, but mind that this probability means that you need to feed your checksum 64TB worth of 16KB blocks, every one of them being corrupt, to let at least one of them go trough unnoticed with 63% probability. So you don't only need to calculate with the throughput of your SSD, but the throughput multiplied with the corruption rate.
I do agree that tens of TBs are not too much data, but mind that this probability means that you need to feed your checksum 64TB worth of 16KB blocks, every one of them being corrupt, to let at least one of them go trough unnoticed with 63% probability. So you don't only need to calculate with the throughput of your SSD, but the throughput multiplied with the corruption rate.