All this is true using Virt-Manager… Especially if you use the qemu-guest-agent.
I just looked them up and maybe you are right. But QEMU definitely lacks a GUI config tool that is both easy to use and allows for advanced features like snapshots. So far the only ones I know is GNOME Boxes and Virt Manager, and neither is as good as providing handy ways to configure as VirtualBox. I could probably just write the XML config or QEMU command by the documentation, but next time it could be a different scenario so I have to investigate the docs and maybe a few more forum posts. In VirtualBox, the buttons that do everything for me are always there
But QEMU definitely lacks a GUI config tool that is both easy to use and allows for advanced features like snapshots.
Let me say it louder for the people in the back: https://virt-manager.org/
It literally does everything you mentioned, including allowing you to edit the XML files manually to reach advanced or obscure features that are not exposed. And it can do it remotely via SSH, and it managed LXC and Xen too.
Last time I tried Virt manager, I couldn’t figure out bridge networks and ended up corrupted the XML config for the VM. Skill issue for me I guess