I would like to see the list of post installed packages included in the backup.
opkg list-installed > packlist.txt
Makes a list of ALL installed packages That also would be helpfull...
But i would like to see Lede create a commandline to install those ADDITIONAL packages again
opkg update
opkg install
So when you re install a backup that the list of packages that still need to be installed is included in that backup. As a quick way to replace a complete backup.
A fully automatic re-install process will likely not be created, as there could be changes in package dependencies etc.
But some ideas for you:
Save the list of installed packages into /etc/config and it will get automatically saved/restored with your settings. opkg list-installed > /etc/config/packlist.txt
There are some scripts that can save package lists and use the list for re-installation after sysupgrade. Read e.g. the discussion here: https://forum.openwrt.org/viewtopic.php?pid=194478#p194478
(I have included mforkel's script in my community build although I do not need it personally)
re: Automated re-install process... It's a little bit of work to set it up, but consider listing all the packages in a script that you can re-run after flashing new firmware.