[IanJRedman]

Why are those standards differences even still a thing post-digital switchover? They should've used the opportunity to create one global default that works worldwide.

The biggest problem is that relatively few manufacturers can be bothered to add 50hz support to US TVs and players, even if the exact same model in the UK supports it. In theory there's nothing else stopping 50hz from being a universally compatible format, like 60hz is.