A few nations have. The USSR, the US for Mars and Several nations have crashed things into the moon, unintentionally, including Israel and India. So maybe the problem wasn't the metric system and something a lot more meaningful instead of what specific arbitrary unit of measurement you think is "better."
e: Like look at this list: https://en.wikipedia.org/wiki/List_of_missions_to_Mars
There are more failures then successes, and only one of those failures was because of different units used for two related measurements. It's weird to even bring it up as a point about the metric system.
Hot Take, the metric system, being a base-10 system sucks for task where you want to make thirds/fourths of something to come out as a round number. It's like the people who are huge proponents of metric don't know the purpose of a human-centric systems of measurement and think that the ascetics of appending "kilo" or "milli" to something is the purpose on it's own.
It's not about thirds and fourths per se. It's actually about lack of divisors. In our current metric system of base 10. We have two divisors, 2 and 5. That's it. No matter if you are talking kilometer, gigameter's whatever, it's just 2's and 5's The imperial system uses more divisors to make the system more useful. There are 5280 feet in a mile. But why? Well because that number has divisors of 2,3,5 and 11. Which allows you a lot of flexibility for how you want to divide a mile. Or think about time, 3600 seconds in an hour, 24hrs in a day, that's a lot of ways you can easily divide up time. The ability to divide these arbitrary units of time is what makes them useful.