Aren't checksums for error detection and not error correction? As I understand it, error correction is having enough information to correct the error while error detection is only knowing an error has occurred.
Error correction only makes sense if the latency of the read/write is long(i.e. spinning physical medium, co-sharrd radio channels).
FEC isn't free(~2x overhead per bit recovery if I remember right) so if your error rates are infrequent then it's worse to use FEC over just resend/reread.
I guess checksums are ok for many applications if USB implements resending of data at the protocol level. For high-speed cameras it might be problematic though.