Nope, but regarldess of drivers, xorg has never been pixel perfect and tearing do happens. You are just probably used to it but it is obvious once you have started using wayland how smoother your desktop becomes.

It is the first time I hear about that Tearfree option and I am wondering. If it exists and it isn't the default behavior, it means there must be some annoying drawbacks right?

Perhaps I might be used to it, won't deny it. No idea about drawbacks from the workaround. Wayland transition is planned though: https://github.com/QubesOS/qubes-issues/issues/3366