That depends significantly on your team's measure of points. My team would never waste time trying to split a 5. But a 34, we would almost always try to split

That depends significantly on your team's measure of points. My team would never waste time trying to split a 5. But a 34, we would almost always try to split. 21s, we try to limit how many of them there are, but we're wary of splitting too much because splitting them up into, say, three separate 8s and then having to add a 13 to puzzle piece them all back together again isn't necessarily an improvement. But I think our points scale is quite different from what many other teams use. In any case, you have to be wary of splitting things too much (or not enough). If your 'bricks' are 8s, 13s, and 21s, then splitting a 5 is just making more work. But if your 'bricks' are 1s, 2s, and 3s, then splitting a 5 may well be a good idea.