Although I disagree with the grandparent post, I'd be fine with saying that long term long distance relationships are harder to make work. Mostly this is because there's a lack of cultural guidelines for how to handle it; if you're living with or near someone there's a cultural script to follow which mostly-works, but in a LDR you can't count on that and you need to put the work in to build your own system.

Of course, relying on the default cultural script for local relationships often falls down as well when it turns out that you disagree about the details. But we accept that relationships fail all the time, and don't tend to say "local relationships don't work" just because many of them fail. :D