Neat.
The table is reality. This gives a better glimpse into what can be predicted for the future. Based on current form, some teams should even upwards towards their mean, while others will drop.
This can often be told just by watching, but the numbers can back up what is being observed, or sometimes contradict it to make one look deeper.
I don't see this sort of thing as necessarily saying Team X should be higher up than they are - results are results, but it can show how some teams have more 'luck' than others, or that a team is expected to tail off considerably if they continue in current form.
I.E. if Chelsea continue to play as they have been, they would be expected to lose some matches or have some more draws - obvious in that extreme case, but the interesting bits (to me) are in the finer grain numbers.
It's not for everyone, but it legitimately has a place to assist in the understanding of reality. It's kind of what math(s) does.