I feel like a majority of shows in the U.K. tend to only go for a few seasons then stop. Compare that to typical shows in the U.S. getting beaten to death, having most viewers think the show might have gone one season too long.
That could mean the stories are written to wrap up mostly nicely, instead of leaving cliff hangers to lead to the potential next season.
Compare Weeds (8 Seasons) to Breaking Bad (5 Seasons), B.B was written to not drag on forever. The recent GoT season finale, where lots of fans went a bit overboard with their reactions when the show runners ran out of their own original ideas. LOST, anyone?
My best example is looking at Black Mirror. When that was mainly for a U.K. audience the first two seasons could have ended and that would have been the best two season show. Netflix did swoop in and that gave us White Christmas(?), but the show has definitely been tailored to American audiences and maybe the premise is being drawn out too much at this point. Don't get me wrong, I love me some more Black Mirror or any of the other shows listed above, but sometimes a story needs to end even if it means its shorter than you expected.