Roleplaying games are a conversation. Like any conversation, they’re at their best when the people in them are engaged and present, not distracted. Playing an RPG means sharing a collaboratively created world and holding that mutual fiction in your mind; thus, the conversation suffers when people disengage.
I recently ran an impromptu game of D&D 5e for some friends. While I was asking the players for their character’s connections to the other players and the world around them, one person said (I paraphrase) “I don’t have any connections. I live alone in the woods and don’t know or care about these people.”
I was a bit short with the player in response, and pushed them to come up with some connections, even if they didn’t feel like close ones. The player did.