I have plenty of newer computers in the shared keyboard/mouse span of monitors in my array of desktop computers. It's just that they run newer software and newer software is worse software. Things have been mostly downhill in linux UI since "convergence" with mobile, IBM/Red Hat's dumbing down of Gtk, and the take-over of containers over actually running applications on your OS.
Try copying a file path to clipboard then using a Gtk3/4 program and opening a File->Open dialog and pasting the file path in. There'll be no text-input area there to paste in to and it will give an error. https://gitlab.gnome.org/GNOME/gtk/-/issues/5872 This has been a known issue since they caused it in 2014 by removing the gsettings to allow for having text entry bars.
