I think it is a very valid question to discuss why FreeBSD keeps sendmail but dropped BIND.
The security concerns of sendmail seem also a valid question - but these have already been discussed for more than twenty years.
The other aspect (and this is a personal one, but i think Off-Topic is a place to state personal impressions, too) whenever I need to lookup some of the features of sendmail (and I do it in the way we do things nowadays: I use google) then I end up at a snake-oil selling company (and the first thing they demand is that you disengage the security settings of your browser).
This is not an isolated effect, it rather seems to reflect the state of the Internet as a whole: whenever I try to lookup some other term, say psychology, social development or mysticism, I also get only to lots of snake-oil selling companies. In contrast, some 15 years ago there was still lots of valuable information to be found. This has mostly disappeared, in favour of "buy our crap!".
(It is better with BIND - there is also the "buy our products!" stuff, but there you get to an .org site, you get the impression that there are actual engineers involved, and they indeed have the current manual online. )
So this is what annoys me. I don't care if one or the other shop is linked to one or the other secret service or whatever, because there is a simplified approach: just consider them all criminals and you will not be surprized by their actions.