Why would they want to do that? It's extra work, extra downtime potential, and I believe literally no competing service of theirs uses it either. I mean, congrats on getting .HT fixed (when did that happen?), but I wouldn't enable it without a good reason.
Because DNS is an insecure protocol and DNSSEC adds a layer of security that protects against bad actors? It's beneficial to the business and it's consumers? Why do I put locks on my door, I've never been robbed...