I still have many fragments of plasma5 (e.g. qt5-x11extras) after upgrading to Plasma 6.0.1.
Is it safe to remove all the qt5-*packages?
(Of course I know that many of those in the following list are not related to plasma at all. I searched for all packages related to 5)
$ pacman -Ss 5 | grep installed
core/db5.3 5.3.28-4 [installed]
core/krb5 1.21.2-2 [installed]
core/libksba 1.6.6-1 [installed]
core/pcre 8.45-4 [installed]
core/pcre2 10.42-2 [installed]
core/perl 5.38.2-1 [installed]
extra/a52dec 0.8.0-2 [installed]
extra/appstream-qt5 1.0.2-1 [installed]
extra/attica5 5.115.0-1 (kf5) [installed]
extra/avahi 1:0.8+r194+g3f79789-1 [installed]
extra/avogadrolibs-qt5 1.99.0-1 [installed]
extra/bluez-qt 6.0.0-1 (kf6) [installed]
extra/fcitx5 5.1.8-1 (fcitx5-im) [installed]
extra/fcitx5-configtool 5.1.4-1 (fcitx5-im) [installed]
extra/fcitx5-gtk 5.1.2-1 (fcitx5-im) [installed]
extra/fcitx5-qt 5.1.5-1 (fcitx5-im) [installed]
extra/frameworkintegration5 5.115.0-1 (kf5) [installed]
extra/globalprotect-openconnect 1.4.9-1 [installed]
extra/gsfonts 20200910-3 [installed]
extra/haskell-crypton-x509 1.7.6-27 [installed]
extra/haskell-crypton-x509-store 1.6.9-27 [installed]
extra/haskell-crypton-x509-system 1.6.7-27 [installed]
extra/haskell-crypton-x509-validation 1.6.12-27 [installed]
extra/haskell-socks 0.6.1-236 [installed]
extra/hdf5 1.14.3-1 [installed]
extra/jbigkit 2.1-7 [installed]
extra/js115 115.8.0-1 [installed]
extra/karchive5 5.115.0-1 (kf5) [installed]
extra/kauth5 5.115.0-1 (kf5) [installed]
extra/kbookmarks5 5.115.0-1 (kf5) [installed]
extra/kcmutils5 5.115.0-1 (kf5) [installed]
extra/kcodecs5 5.115.0-1 (kf5) [installed]
extra/kcompletion5 5.115.0-1 (kf5) [installed]
extra/kconfig5 5.115.0-1 (kf5) [installed]
extra/kconfigwidgets5 5.115.0-1 (kf5) [installed]
extra/kcoreaddons5 5.115.0-1 (kf5) [installed]
extra/kcrash5 5.115.0-1 (kf5) [installed]
extra/kdbusaddons5 5.115.0-1 (kf5) [installed]
extra/kde-cli-tools 6.0.1-1 (plasma) [installed]
extra/kdeclarative5 5.115.0-1 (kf5) [installed]
extra/kded5 5.115.0-1 (kf5) [installed]
extra/kdoctools5 5.115.0-1 (kf5) [installed]
extra/kglobalaccel5 5.115.0-3 (kf5) [installed]
extra/kguiaddons5 5.115.0-2 (kf5) [installed]
extra/ki18n5 5.115.1-1 (kf5) [installed]
extra/kiconthemes5 5.115.0-1 (kf5) [installed]
extra/kimageformats5 5.115.0-2 (kf5) [installed]
extra/kio5 5.115.0-3 (kf5) [installed]
extra/kirigami2 5.115.0-1 (kf5) [installed]
extra/kitemviews5 5.115.0-1 (kf5) [installed]
extra/kjobwidgets5 5.115.0-1 (kf5) [installed]
extra/knewstuff5 5.115.0-1 (kf5) [installed]
extra/knotifications5 5.115.0-1 (kf5) [installed]
extra/kpackage5 5.115.0-1 (kf5) [installed]
extra/kplotting5 5.115.0-1 (kf5) [installed]
extra/kservice5 5.115.0-1 (kf5) [installed]
extra/ktextwidgets5 5.115.0-1 (kf5) [installed]
extra/kunitconversion5 5.115.0-1 (kf5) [installed]
extra/kwallet5 5.115.0-2 (kf5) [installed]
extra/kwayland5 5.115.0-1 (kf5) [installed]
extra/kwidgetsaddons5 5.115.0-1 (kf5) [installed]
extra/kwindowsystem5 5.115.0-1 (kf5) [installed]
extra/kxmlgui5 5.115.0-1 (kf5) [installed]
extra/libdbusmenu-qt5 0.9.3+16.04.20160218-7 [installed]
extra/libde265 1.0.15-1 [installed]
extra/libmysofa 1.3.2-1 [installed]
extra/libunibreak 6.1-1 [installed]
extra/libva-intel-driver 2.4.1-2 [installed]
extra/lua-lpeg 1.1.0-1 [installed]
extra/luajit 2.1.1702233742-1 [installed]
extra/openjpeg2 2.5.2-1 [installed]
extra/plasma5support 6.0.1-1 (plasma) [installed]
extra/polkit-qt5 0.200.0-1 [installed]
extra/prison5 5.115.0-1 (kf5) [installed]
extra/purpose5 5.115.0-3 (kf5) [installed]
extra/python-json5 0.9.22-1 [installed]
extra/python-uri-template 1.3.0-1 [installed]
extra/python-websockets 12.0-1 [installed]
extra/qca-qt5 2.3.8-2 [installed]
extra/qscintilla-qt5 2.14.1-1 [installed]
extra/qt5-base 5.15.12+kde+r151-1 (qt5) [installed]
extra/qt5-declarative 5.15.12+kde+r32-1 (qt5) [installed]
extra/qt5-feedback 0.0.0.20150918-4 [installed]
extra/qt5-graphicaleffects 5.15.12-1 (qt5) [installed]
extra/qt5-imageformats 5.15.12+kde+r10-1 (qt5) [installed]
extra/qt5-location 5.15.12+kde+r6-1 (qt5) [installed]
extra/qt5-multimedia 5.15.12+kde+r2-1 (qt5) [installed]
extra/qt5-quickcontrols 5.15.12-1 (qt5) [installed]
extra/qt5-quickcontrols2 5.15.12+kde+r5-1 (qt5) [installed]
extra/qt5-remoteobjects 5.15.12-1 (qt5) [installed]
extra/qt5-script 5.15.16-2 (qt5) [installed]
extra/qt5-speech 5.15.12+kde+r1-1 (qt5) [installed]
extra/qt5-svg 5.15.12+kde+r6-1 (qt5) [installed]
extra/qt5-tools 5.15.12+kde+r4-2 (qt5) [installed]
extra/qt5-translations 5.15.12-1 (qt5) [installed]
extra/qt5-wayland 5.15.12+kde+r61-1 (qt5) [installed]
extra/qt5-webchannel 5.15.12+kde+r3-1 (qt5) [installed]
extra/qt5-webengine 5.15.16-3 (qt5) [installed]
extra/qt5-websockets 5.15.12+kde+r2-1 (qt5) [installed]
extra/qt5-x11extras 5.15.12-1 (qt5) [installed]
extra/qt6-5compat 6.6.2-1 (qt6) [installed]
extra/qt6-websockets 6.6.2-1 (qt6) [installed]
extra/qtkeychain-qt5 0.14.2-1 [installed]
extra/solid5 5.115.0-1 (kf5) [installed]
extra/sonnet 6.0.0-1 (kf6) [installed]
extra/sonnet5 5.115.0-1 (kf5) [installed]
extra/syndication5 5.115.0-1 (kf5) [installed]
extra/texlive-bin 2023.66984-19 [installed]
extra/texlive-fontsextra 2023.66594-20 (texlive) [installed]
extra/texlive-latexextra 2023.66594-20 (texlive) [installed]
extra/texlive-pictures 2023.66594-20 (texlive) [installed]
extra/vala 0.56.15-1 [installed]
extra/x265 3.5-3 [installed]
extra/xdg-desktop-portal-kde 6.0.1-1 (plasma) [installed]