Is this expected behavior?

[Paul Beard]

I explored installing letscrypt and for some reason, pkg seems to think it knows more about what I want installed than I do. 

./letsencrypt-auto --help --debug
grep: /etc/os-release: No such file or directory
Bootstrapping dependencies for FreeBSD...
+ pkg install -Ay git python py27-virtualenv augeas libffi
Updating FreeBSD repository catalogue...
FreeBSD repository is up-to-date.
All repositories are up-to-date.
Updating database digests format: 100%
The following 19 package(s) will be affected (of 0 checked):

Installed packages to be REMOVED:
        rrdtool-1.4.8_9
        subversion-1.9.3_1
        serf-1.3.8_1

Why is pkg removing *anything?* Why is the default behavior to remove ports? I have had to install subversion twice today after pkg decided I didn’t really need it. 

I avoid using pkg for this reason as well as the fact it can’t cope with specific config options I need, so I generally build from source. 

Why did it remove rrdtool? Does it not know that rrdtool is a dependency of cacti? Ah, I see now cacti was removed at some point when I wasn’t watching. 

Is there a switch for “don’t remove anything unless explicitly instructed to?”