XDR is a completely different conception of a protective system, which differs sharply from the essence of an ordinary antivirus. The latter offers a protection for a single or several devices, but they are always served separately from each other. XDR manages the security of all devices in the network, including even IoT devices, and forms a simultaneous response of all participants.
For corporations, XDR really replaces antivirus, as the last one does not offer suitable protection for a massive corporate network. To correspond with the modern threat landscape, a complex solution is required - and XDR is the one.