Default packages on your system are often not installed individually but dragged in as a dependency to a "meta" package. When you have removed that meta package, you favorite package manager must assume that you have no interest in what was installed only to make that meta package happy.
For instance have a look at kde-standard (of my Ubuntu machine):
apt-cache show kde-standard
Package: kde-standard
Architecture: amd64
Version: 5:100ubuntu2
Priority: optional
Section: universe/metapackages
Source: meta-kde
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 21
Depends: akregator (>= 4:17.08.3), ark (>= 4:17.08.3), dragonplayer (>= 4:17.08.3), gwenview (>= 4:17.08.3), juk (>= 4:17.08.3), kaddressbook (>= 4:17.08.3), kate (>= 4:17.08.3), kcalc (>= 4:17.08.3), kde-plasma-desktop (>= 5:100ubuntu2), kde-spectacle (>= 17.08.3), khelpcenter (>= 4:17.08.3), kmail (>= 4:17.08.3), knotes (>= 4:17.08.3), kopete (>= 4:17.08.3), korganizer (>= 4:17.08.3), kwalletmanager (>= 4:17.08.3), okular (>= 4:17.08.3), plasma-dataengines-addons (>= 4:5.10), plasma-pa (>= 5.10) | kmix (>= 4:17.08.3), plasma-runners-addons (>= 4:5.10), plasma-wallpapers-addons (>= 4:5.10), plasma-widgets-addons (>= 4:5.10), polkit-kde-agent-1 (>= 4:5.10), sweeper (>= 4:17.08.3)
Recommends: konq-plugins (>= 4:17.08.3), plasma-nm (>= 4:5.10)
Suggests: skanlite
Breaks: kde-minimal (<< 5:57)
Filename: pool/universe/m/meta-kde/kde-standard_100ubuntu2_amd64.deb
Size: 2096
MD5sum: c695504c343f43d52d27d2d2a7afb1c6
SHA1: 309939b0aa4925fe8abde6405cc8e610cd514a7d
SHA256: 93ba353ff7f6fc0d6994fafaab5a49bc2ddbdaa157eb9d7174ae7ef2a6a70558
Homepage: http://www.kde.org
Description-en: KDE Plasma Desktop and standard set of applications
The KDE Software Compilation is the powerful, integrated, and easy-to-use Free
Software desktop platform and suite of applications.
.
This metapackage includes the KDE Plasma Desktop and a selection of the most
common used applications in a standard KDE desktop.
Description-md5: 22b1a1d202f3643155a96f5ad211c0fb
If removing kde-standard, then you are likely to remove your favorite kcalc, too. kde-plasma-desktop likely was also installed directly so this would not be offered for autoremoval.