The success of many a day is determined by looking at the overall picture.
That's how we get into trouble.
The overall appearance of a house may be fine but there is a real problem if termites are at work. Some problems can quickly trump others and many of the ones that do are not dramatic events; they are small nibblers.
Measuring the incremental gains or losses in key categories takes time, insight, and discipline and yet it is a far more accurate measure of progress than a snapshot that hides more than it reveals.
It was C.S. Lewis who observed that the road to hell is a slight, comfortable, and grassy slope.