You don't miss out on anything if it does what you need.
For me apt is just slow and clunky, don't like the way some of the commands are and they are long, I prefer the way that pacman and portage do it where I can make commands be sinple and only be couple characters instead of whole words.
I liked pacman because it was fast, and it was really easy to block a package from upgrading and downgrading packages is really easy.
I liked portage because it worked with program's sources so I was able to just remove part's of program's and their dependencies I didn't need.
I like nix now because of the way it manages dependencies, and for the fact that packaing programs in it is really easy to do.