AFAIK, if you want disk encryption on Arch, you gotta set it up yourself (i.e. follow the wiki).
And last time I installed manjaro (couple years ago), the installer would let you decide whether you want disk encryption or not. So nobody is being forced to use it.
Then again, if you are tired of it, there likely is a way to effectively disable it for your current install. But most likely that will be quite a bit more involved that just unchecking it during install.
I assume the original comment meant code based projects, for which git, if repo is pushed to a remote, is a very sane choice.