Docker blocking Xbox chat is not a platform issue but a docker issue and OP doesn’t even want to take time to file a proper bug report so yes kids would be better off using a pc or their own.
Same would go for any console, phone etc. You can’t just install stuff with known issues from 3rd parties, not file report with any diagnostics and then blame it on the platform. Would you blame iOS for a badly behaving app that makes it hard for the kids to use the iPad?