Fedora installs both by default. I didn't found what are them exactly for, but
yum autoremove selects them for autoremoval.
Is it safe, for a normal user (I mostly use this machine for documents and programming) to uninstall them?
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The libvert and QEMU packages are apparently dependencies of GNOME Boxes, Fedora’s native hypervisor, so, if you uninstall them, you will also uninstall your system’s virtual machine.
Aside from that, based on my testing of Fedora 30 (including a system reboot), uninstalling these packages doesn’t cause any harm to the system.