Tasks these scripts can accomplish

All supported distros

Update your distro including Snaps or Flatpaks if that support is enabled
- Enable Flatpak or Snap support
Optimize mirrors on certain distros to get a faster download
Install codec packages
Install common software not always installed by default
Install different theme packs for various desktops (KDE/Plasma 5 not really included since that theme installing is built into Plasma)
Cleanup different aspects of your Linux system
Displays various info about the current system
Detect status of and (if disabled) re-enable os_prober

(For Debian - code is being redone so this is an untested WIP)
- Install Linux Firmware packages (non-free i think that some users need)
- Add user to sudoers file
- Add "contrib" and "nonfree" repos
- Add Archive Support
- Add/Installs Intel Microcode packages
(For Fedora)
- Either install Fedy or manually apply various Fedy tasks
  - Install Archive support
  - Install Microsoft Fonts
  - Install Codecs
  - Install Theme Engines
  - Improve font rendering
(For OpenSUSE)
- Install Cinnamon
  - since there is no Cinnamon spin I am aware of, this is what I have used in the past .. use say JWM to get an OpenSUSE system up and then run this.
(For Ubuntu)
- Disable and remove the Firefox snap and replace it with the normal package from a Mozilla PPA
- Install common packages not always installed by default
  - Including Synaptic, Gnome-tweak and Gdebi