HardenedBSD is some young people that have very little experience with C and computer architecture picking bones against some people in the FreeBSD community who have that experience in spades and becoming angsty and upset that they are unable to meet requisites for merge. Altering the VM doesn't happen quickly, especially when you have no track record of working on that subsystem.
Comparing HBSD to grsecurity is insulting to grsecurity, there is no similarity.
That wasn't my impression, but I'm not qualified to judge the diffs on the code level, so I'll note that their changes may possibly be of lower quality than they are advertised.
Comparing HBSD to grsecurity is insulting to grsecurity, there is no similarity.