Crossplay has been a huge thing for me and my friends. We started playing games online together during the early 360 era, but when the PS4 and Xbox One were announced, I split for the PS4. I didn’t like MS’s plan for their new console and I had fallen for the PS3 late in its life. We had been playing online games together less and less in the intervening years (but still played in person), until we all got the Switch.
But when Minecraft and Rocket League and Fortnite and added crossplay, it was a revelation! We could all play on whatever the hell we liked. I preferred the Pro Controller and portability on the Switch, my friends liked the Xbox, some moved to PC. It was this new freedom that still feels kinda wild to take part in.
It also really helped the anemic online lobbies for multiplatform games on Switch. I think there were like 10x more players in Rocket League for Switch after PC crossplay was added. It was crazy.