Also there are so many dialects with heavy variables that it’s entirely possible to get a group of people all speaking english who can’t understand each other. Throw someone with a thick Louisiana Cajun accent, a West Country dude, and Nevada hick into a room together and I don’t think they’d understand each other. Maybe the hick could understand the West Countryman but that’d be about where it’d end.
Also there are so many dialects with heavy variables that it’s entirely possible to get a group of people all speaking english who can’t understand each other. Throw someone with a thick Louisiana Cajun accent, a West Country dude, and Nevada hick into a room together and I don’t think they’d understand each other. Maybe the hick could understand the West Countryman but that’d be about where it’d end.