But it can be, and it is. It’s an accepted definition by many users. I don’t think it’s a perfect definition, as it is relatively easy for me to get a Canadian QSO. But it is essentially the default definition used by many operators, and I think it would be a mistake to not allow users to apply it to their QSO logs.
WRL would be better received and integrated into the amateur radio community if it allows for a variety of uses, including the “out of country only” DX definition, regardless of how we individually feel about the logic of the definition. Other logging programs use this definition.
The ability of a European operator to get more DX QSOs on the internal leaderboard is not a concern of mine. I’m more concerned with the actual use of WRL and its ability to attract and retain users.
Your earlier suggestion using two defaults was good, because it allows for other definitions used around the world. Those who want to use a minimum distance would be covered by your second default suggestion. Default 1 simply needs to be modified to allow the simple out-of-country definition used by operators and competitor logging programs/apps.
EDIT: It may be that other logging programs, and perhaps WRL, use QSOs to a different DX entity to identify a DX QSO, which in not necessarily out of country as I stated. For example, Hawaii and Alaska are DX for an operator in the continental USA. It’s not a perfect definition but one we should at least have as an option.