I saved this but forgot to post it just before the 6.0.1 release: DragonFly now has OpenSSH 8.8p1. The OpenSSH release notes mention that SHA-1 RSA keys signatures (thanks, Ross Richardson for the correction) will no longer work, along with other updates. You are hopefully already using something else.
xdisk is now being built by default, and libdmsg is able to encrypt/decrypt with a placeholder scheme.
Yes, this means you can mount remote Hammer2 disks as a block device. Read the man pages and remember this is experimental.