Why udisks is not in the system

In Trusty udisks2 is installed by default and used by nautilus.

The binary is in

/usr/bin/udisksctl

found via dpkg -L udisks2 | grep bin/

from man udisksctl

NAME
       udisksctl - The udisks command line tool

SYNOPSIS
       udisksctl status

       udisksctl info {--object-path OBJECT | --block-device DEVICE}

       udisksctl mount {--object-path OBJECT | --block-device DEVICE} [--filesystem-type TYPE] [--options OPTIONS...] [--no-user-interaction]

       udisksctl unmount {--object-path OBJECT | --block-device DEVICE} [--force] [--no-user-interaction]

       udisksctl unlock {--object-path OBJECT | --block-device DEVICE} [--no-user-interaction]

       udisksctl lock {--object-path OBJECT | --block-device DEVICE} [--no-user-interaction]

       udisksctl loop-setup --file PATH [--read-only] [--offset OFFSET] [--size SIZE] [--no-user-interaction]

       udisksctl loop-delete {--object-path OBJECT | --block-device DEVICE} [--no-user-interaction]

       udisksctl power-off {--object-path OBJECT | --block-device DEVICE} [--no-user-interaction]

       udisksctl smart-simulate --file PATH {--object-path OBJECT | --block-device DEVICE} [--no-user-interaction]

       udisksctl monitor

       udisksctl dump

       udisksctl help

Here is a short test

% sudo apt-get remove udisks2
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  arronax arronax-nautilus brasero deja-dup-backend-gvfs gnome-disk-utility
  gnome-shell-extensions gnome-sushi gvfs gvfs-backends gvfs-backends-goa
  gvfs-daemons gvfs-fuse nautilus nautilus-sendto nautilus-share software-center
  ubuntu-gnome-desktop udisks2 usb-creator-common usb-creator-gtk
0 upgraded, 0 newly installed, 20 to remove and 0 not upgraded.
After this operation, 20,9 MB disk space will be freed.
Do you want to continue? [Y/n]

% sudo apt-get remove udisks
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  udisks
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 1.043 kB disk space will be freed.
Do you want to continue? [Y/n]

I was using udisks to mount an NTFS partition on the same disk as the Operating System. My command looked like this

/usr/bin/udisks --mount /dev/disk/by-uuid/

I used this command in 16.04 (mint 18):

udisksctl mount --block-device /dev/disk/by-uuid/