Some distros use KDE which is Qt which means that to install a gnome app (which uses gtk) you need to also install shitload of other dependencies. Fresh installs usually don't mix KDE and Gnome apps. There a different default for them. So saying that a Gnome app should be default for Linux doesn't make much sense.

I mainly use Gnome apps and this is what I'm getting on my system:

apt-get install konsole
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  kactivitymanagerd kded6 keditbookmarks kio6 konsole-kpart kpackagetool6 kwallet6 libhfstospell11 libkf6archive-data libkf6archive6 libkf6attica6 libkf6auth-data libkf6authcore6 libkf6bookmarks-data libkf6bookmarks6
  libkf6bookmarkswidgets6 libkf6breezeicons6 libkf6codecs-data libkf6codecs6 libkf6colorscheme-data libkf6colorscheme6 libkf6completion-data libkf6completion6 libkf6configgui6 libkf6configqml6 libkf6configwidgets-data
  libkf6configwidgets6 libkf6coreaddons-data libkf6coreaddons6 libkf6crash6 libkf6dbusaddons-bin libkf6dbusaddons-data libkf6dbusaddons6 libkf6doctools6 libkf6globalaccel-data libkf6globalaccel6 libkf6guiaddons-bin libkf6guiaddons-data
  libkf6guiaddons6 libkf6i18n-data libkf6i18n6 libkf6i18nqml6 libkf6iconthemes-bin libkf6iconthemes-data libkf6iconthemes6 libkf6iconwidgets6 libkf6itemmodels6 libkf6itemviews-data libkf6itemviews6 libkf6jobwidgets-data libkf6jobwidgets6
  libkf6kcmutils-bin libkf6kcmutils-data libkf6kcmutils6 libkf6kcmutilscore6 libkf6kcmutilsquick6 libkf6kiocore6 libkf6kiogui6 libkf6kiowidgets6 libkf6newstuff-data libkf6newstuffcore6 libkf6newstuffwidgets6 libkf6notifyconfig-data
  libkf6notifyconfig6 libkf6package-data libkf6package6 libkf6parts-data libkf6parts6 libkf6pty-data libkf6pty6 libkf6runner6 libkf6service-bin libkf6service-data libkf6service6 libkf6solid-data libkf6solid6 libkf6sonnet-data
  libkf6sonnetcore6 libkf6sonnetui6 libkf6syndication6 libkf6textwidgets-data libkf6textwidgets6 libkf6wallet-data libkf6wallet6 libkf6walletbackend6 libkf6widgetsaddons-data libkf6widgetsaddons6 libkf6xmlgui-data libkf6xmlgui6
  libkirigami-data libkirigami6 libkirigamidelegates6 libkirigamidialogs6 libkirigamilayouts6 libkirigamiplatform6 libkirigamiprimitives6 libkirigamiprivate6 libplasmaactivities6 libpolkit-qt6-1-1 libqca-qt6-2 libqca-qt6-plugins
  libqt6core5compat6 libqt6quickcontrols2-6 libqt6quickshapes6 libqt6quicktemplates2-6 libvoikko1 media-player-info plasma-activities-bin qml6-module-org-kde-config qml6-module-org-kde-kcmutils qml6-module-org-kde-kirigami
  qml6-module-org-kde-newstuff qml6-module-qtcore qml6-module-qtqml qml6-module-qtqml-models qml6-module-qtqml-workerscript qml6-module-qtquick qml6-module-qtquick-controls qml6-module-qtquick-layouts qml6-module-qtquick-shapes
  qml6-module-qtquick-templates qml6-module-qtquick-window sonnet6-plugins systemsettings

On KDE system you will see the same for any gnome tool.