[mig39]

Is it also to allow other nodes on the network to communicate, especially if they're on the same collision domain?

[supahfly_remix]

No. Wired ethernet hasn't used collison-based protocols in a long time. It's point-to-point now, not shared.

[dublin]

Actually, even though most connections are switched point-to-point these days, any properly functioning implementation (definitely up through 100Mbps) must still implement CSMA/CD. It's required for proper functioning of Ethernet hubs and some bridges!