zypper rm -u *
doesn’t that command remove every package you basically uninstalled everything
afaik zypper does not have an equivalent to apt-get automove cleandeps is good when removing packages that might have pulled a lot of dependencies and while zypper doesn’t do autoremove it’s dependency resolver is great
regarding unneeded software I’ve noticed a bug in 42.3 (I don’t know about TW) where a lot and I do mean a lot of packages get flagged as unneeded this included some nvidia driver packages (for me) this didn’t exist in 42.2 and older
I didn’t really see the need to open a bug report but as a caution:
Do not remove packages flagged as unneeded in yast (or zypper with zypper packages --unneede) as most of them are needed