https://www.biorxiv.org/content/10.1101/2021.05.26.445798v1
Sequencing godfather George Church, a biologist at Harvard University, told Stat if this work goes through peer review successfully, it will be the first time any vertebrate genome has been fully mapped. And the reason seems to be simply that both new technologies allow very long strings of base pairs to be read at once.
Why is the missing gene information so important? Well, the study of genes experiences a lot of favoritism, with a handful of most popular genes taking up the bulk of research interest and funding. The overlooked genes hold a lot of key mechanisms that cause disease, for example.